Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1e644920b5f151…

MALICIOUS

PDF

81.4 KB Created: 2021-03-26 10:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5ef0701b48782e58640d81dce4921c56 SHA-1: dc610917042fc5b65f1d6753713cdf320aa5f9f5 SHA-256: 1a1e644920b5f151ed135ba30c524f5bf0cfb37c8ab338a14c7a9ac752067634
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate the redirection or download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/wix?keyword=surface+area+to+volume+ratio+worksheet+tes PDF link annotation
    • https://zabaruwizugode.weebly.com/uploads/1/3/4/5/134596412/5312801.pdfIn PDF document text
    • http://kompledom.com/85833698612kziyp.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/gugitow.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/2446666.pdfIn PDF document text
    • https://gilibowipasumew.weebly.com/uploads/1/3/4/5/134578686/8010491.pdfIn PDF document text
    • http://3bureaureport.info/borderlands_2_skill_points_guidesins5.pdfIn PDF document text
    • http://meinekarten.best/el_hobbit_2_online_castellano_gratisof8fy.pdfIn PDF document text
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/9342923.pdfIn PDF document text
    • https://sadewirezetif.weebly.com/uploads/1/3/4/3/134318623/zisumo.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/juwovomu-xosamiva-koxodalo.pdfIn PDF document text
    • https://mamowoxu.weebly.com/uploads/1/3/4/2/134265364/6609888.pdfIn PDF document text
    • http://maslovauto.ru/fallout_76_tank_buildy2l7y.pdfIn PDF document text
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/jedenutikakux.pdfIn PDF document text
    • http://salearea.pro/obra_mi_planta_de_naranja_lima_personajes_principales_y_secundariosut82s.pdfIn PDF document text
    • http://cetop.xyz/60555297030dq05.pdfIn PDF document text
    • http://prostotit.site/what_is_the_overall_meaning_of_the_poem_the_raven5xfpt.pdfIn PDF document text
    • http://cafe-cok.ru/380647799591uedh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/libro_ser_bachiller.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/paletikato.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/kofajiriketokevuwobikiz.pdfIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_8f2083f3465c41278706735c0bdc60da.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_1faa93f98f4c42fb95f9c39c1d9cc637.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_3a5b2592afbf46a4a085a560052a7d77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/dazivumiwagip.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/intracranial_hypotension_treatment_guideline.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_45a372dff5b5436db1695d955ef3f940.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_fcb03053a7034e1fb99f012dcb14578d.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 5440 bytes
SHA-256: 7acec8e4652c831faab0220e95733a1fa6fc75b3189bfc6450363a727c5ea4e5
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 10724 bytes
SHA-256: 716e9f8a0ebcf09c676dea4c2f05aaa09b4a09bbbad49036c34d4c020b8b72e0
font_02_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 16088 bytes
SHA-256: a31bcf556e181db077c9b64db679e746f1af4c47e86886feaa6b1c1c5ec82d40