Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdcaa18466206dc…

MALICIOUS

PDF

36.6 KB Created: 2020-06-16 06:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 358da0312d35954132669d182610a51c SHA-1: b5c33b0603250c223f1c62605a4e26f24cd92ebe SHA-256: 7fdcaa18466206dc42f6607c5d445e6ec4931f1e8a24072eddaee20cbd0464aa
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to PDF files with numeric slugs, indicative of a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' lure further supports a malicious intent. The primary goal appears to be directing users to download potentially malicious content from the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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 http://host68.carmichaelnl.com/uploads/1/3/0/3/130323130/130323130.html#market+research+lesson+plans PDF link annotation
    • http://patgorgewalker.com/uploads/1/3/0/3/130323302/5816631.pdfIn PDF document text
    • http://hostmaster.navp.co.uk/uploads/1/3/0/4/130488934/4072317.pdfIn PDF document text
    • http://lilyclewis.com/uploads/1/3/0/6/130621055/4968305.pdfIn PDF document text
    • http://padingtonschool.com/uploads/1/3/0/5/130589198/sezonewopexodonugiwi.pdfIn PDF document text
    • http://cpanel.lllofts.com/uploads/1/3/0/2/130291036/mukop.pdfIn PDF document text
    • http://erickajfitness.shop/uploads/1/3/1/3/131379213/votafemaze-vegebirotudame.pdfIn PDF document text
    • http://alantonpta.org/uploads/1/3/0/5/130551880/pofijutagarawox.pdfIn PDF document text
    • http://mta-sts.mail.simonkono.com/uploads/1/3/0/6/130605228/9c2c4ff5.pdfIn PDF document text
    • http://noreply-05.info/uploads/1/3/0/7/130775629/tirofasiwim_serifeluj.pdfIn PDF document text
    • http://goodseedsshop.com/uploads/1/3/1/4/131453111/vuvudemitetigezudu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000628c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628C 10720 bytes
SHA-256: ded8a29afdf38d33bc43b3c47653971e15ea5d7b066e43abbad0a9dfcc4d1c14