Malicious PDF — malware analysis report

Static analysis result for SHA-256 a657fa560c3cd640…

MALICIOUS

PDF

45.7 KB Created: 2020-05-17 22:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ea617d83a38853c4afb060a386b9f8 SHA-1: 27b1370d5d8be4f751416abbcc2f1a3c85e96ac2 SHA-256: a657fa560c3cd6408ceda820cec37f829c5a7c5e4ba019b4a51c7fb498a1ee53
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains references to the URLs, suggesting a lure to external content. The primary purpose appears to be directing users to a network of websites, likely for SEO spam or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://app-pof.com/uploads/1/3/0/6/130621407/130621407.html#psychology+exam+questions+on+conformity
    • http://gwinnetvotes.com/uploads/1/3/0/5/130588678/rebun.pdf
    • http://thebikinistudio.com/uploads/1/3/0/5/130551670/4361643.pdf
    • http://drkranskiseminars.com/uploads/1/3/1/4/131454883/9188ef54b58be19.pdf
    • http://thechildrenofstars.com/uploads/1/3/0/5/130543985/5010936.pdf
    • http://lifestyledby30.com/uploads/1/3/0/6/130620990/2cfeb932d1e.pdf
    • http://lyvd.net/uploads/1/3/1/4/131407324/kujeg.pdf
    • http://fccmeredith.com/uploads/1/3/0/4/130476098/9741757.pdf
    • http://kuwaitsstudnetsorganization.com/uploads/1/3/0/6/130605338/retirub.pdf
    • http://sowerhk.com/uploads/1/3/0/6/130621305/7202280.pdf
    • http://jandbspetmeat.com/uploads/1/3/1/4/131453449/nodabipagaraw.pdf
    • http://raidersrus-guild.com/uploads/1/3/0/5/130590456/zajezujepegadekewul.pdf
    • http://mindfullywellfit.com/uploads/1/3/0/6/130639258/3730954.pdf
    • http://biometrixsystem.net/uploads/1/3/0/4/130476555/6195102.pdf
    • http://universalfreedom.us/uploads/1/3/0/2/130272880/ddc49.pdf
    • http://bdbarriers.com/uploads/1/3/0/5/130550841/a43b6e24a532eb8.pdf
    • http://portfolioinvestmentpty.org/uploads/1/3/1/3/131379541/494207.pdf
    • http://thecharme.online/uploads/1/3/1/3/131379168/8187853.pdf
    • http://taynicolehairextensions.com/uploads/1/3/0/2/130273578/tikunapopibi.pdf
    • http://baycoastnurses.org/uploads/1/3/0/6/130620510/d0b174.pdf
    • http://greatheartyoga.net/uploads/1/3/0/5/130590511/nixudiloxomawa-gaxajoki.pdf
    • http://bostoneducationcompact.org/uploads/1/3/0/3/130323465/5693426.pdf
    • http://azibulldogges.com/uploads/1/3/0/5/130539120/razupilomapuku.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000815d.bin
32a363b528d9cff8ae6a3c01d88c1d311e72f6e258698c5ca14a945c65d7c419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x815D 11720 bytes

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