Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca6970b4b84abe1…

MALICIOUS

PDF

72.6 KB Created: 2021-02-18 21:34:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 580180ca2d0f454adbaa2790c7e788c2 SHA-1: 2be4ab01f2db48239f323cae862b13f1639d642a SHA-256: aca6970b4b84abe12ffd6b2d26c3b8087ed2766d7d4d4ae70d388845861cf2ea
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads or redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/aws?utm_term=what+books+are+in+the+da+vinci+code+series PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414514/normal_5fdd8fe0ccbb7.pdfIn PDF document text
    • https://tavefagizukog.weebly.com/uploads/1/3/0/7/130775361/5089983ee.pdfIn PDF document text
    • http://storeeu.info/vias_de_administracion_de_medicamentostq8ui.pdfIn PDF document text
    • https://radolawijukigi.weebly.com/uploads/1/3/5/9/135992833/lemoposerob_dawuviwemezuge_jajitevubag.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/ijjiS7M/classroom_leadership_styles.pdfIn PDF document text
    • https://fazijexin.weebly.com/uploads/1/3/2/7/132741066/124dfe2d342c9fd.pdfIn PDF document text
    • http://livethailand.fun/cat_room_cute_cat_gamesd7p7i.pdfIn PDF document text
    • http://dimax.website/linear_circuit_design_handbook5wi0o.pdfIn PDF document text
    • https://cdn.sqhk.co/nefijisob/dlhgz3C/78374989146.pdfIn PDF document text
    • http://price-list.moscow/bebotubirubetisisevpaq2m.pdfIn PDF document text
    • http://itchia.space/integral_calculus_problems_and_solutions7byy9.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/OiDigU0/gufit.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/ig6icBR/exothermic_reaction_examples_in_everyday_life.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_6014dc359db52.pdfIn PDF document text
    • http://menbp.online/pawusepelusuxilipazaworoxkq534.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/ibutTdB/blockstarplanet_unblocked_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480744/normal_5ffeb7bedd6ef.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/welanisowari/linisesogokesasum.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 5272 bytes
SHA-256: 03c529b18dae1926d3bc339f6d234d8a1d1ef58cbb829c8e7579cdb5250e221f
font_01_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 11440 bytes
SHA-256: b3ac9c9d43fdaa42e716528c273b93131e8e49831e6c47c2cd8cebdba5817a7a

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