Malicious PDF — malware analysis report

Static analysis result for SHA-256 25aca8b30a193c75…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 19:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 7c5c89c5271fba854879b1e925fb9cd1 SHA-1: fe4bd4cd5ea2749fe4f66239b4dfbdeb61a9d3cf SHA-256: 25aca8b30a193c7555ca3ce8170026866c6ac8dde9a797e2d294af4b6b9e36d3
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://bologen.ru/wix?keyword=active+and+passive+voice+exercise+with+answers PDF link annotation
    • http://tukameduk.22web.org/soralo.pdfIn PDF document text
    • https://panonalosisewe.weebly.com/uploads/1/3/5/3/135316392/xidazasix.pdfIn PDF document text
    • https://vomodubezu.weebly.com/uploads/1/3/5/3/135398809/7167355.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/9912073.pdfIn PDF document text
    • https://kasitawudak.weebly.com/uploads/1/3/1/3/131380619/954feb1.pdfIn PDF document text
    • https://kivifakan.weebly.com/uploads/1/3/4/8/134870172/9015800.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/5e576772878d28e.pdfIn PDF document text
    • https://jeraligasusuwaj.weebly.com/uploads/1/3/4/5/134528446/gikowuvupasaw-majudeviz-talep.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/17704530448.pdfIn PDF document text
    • https://fetepidema.weebly.com/uploads/1/3/4/6/134684810/9969421.pdfIn PDF document text
    • https://xomadugazulu.weebly.com/uploads/1/3/4/5/134597447/5826260.pdfIn PDF document text
    • http://jotusimemirido.sportsontheweb.net/biografia_del_caribe_german_arciniegas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fugirar.epizy.com/wudezig.pdfIn PDF document text
    • http://jolivuk.rf.gd/20003359353.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/anime_apps_free_android.pdfIn PDF document text
    • http://jemileti.atwebpages.com/destruccion_masiva_jean_ziegler.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/52337071199.pdfIn PDF document text
    • http://silejikozi.rf.gd/87464503913.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/boatwise_app_for_android.pdfIn PDF document text
    • http://fuwutowamig.myartsonline.com/articulatory_phonetics_bryan_gick.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/black_and_white_pictures_for_babies.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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 5340 bytes
SHA-256: 4d6117da3b99a4b36a9bf1243d42ec2919ab4b686c063df0193a0261e10d1659
font_01_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 10580 bytes
SHA-256: a4107c78bd240098e349e3a827bfc0636d24acae8a2d1559c8d14edb0d1892f9

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