Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67c18fd62227e91…

MALICIOUS

PDF

42.7 KB Created: 2020-04-01 11:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f40b4c1c3dd3066da09c111a32f56bd6 SHA-1: c7489787bb9d1974c3a4a07f757d8728c7b0208a SHA-256: c67c18fd62227e910cee0ace9a96b09214afa00a13616be401d83c7aabf93c14
94 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The PDF_SEO_LINK_FARM heuristic firing confirms the presence of a mass external link farm. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, but the sheer volume of outbound links suggests a high likelihood of a malicious redirection or content hosting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://poolglasses.com/uploads/1/3/0/6/130620364/130620364.html#hawk+mountain+scout+reservation
    • http://ekituzi.jp/uploads/1/3/0/2/130288768/sapuwofowegusod-zijidasifago-firudisuvi-butet.pdf
    • http://eastandmack.com/uploads/1/3/0/5/130588961/junizorutenebumuku.pdf
    • http://howeaboutthat.com/uploads/1/3/0/7/130776253/giwolemukotefi.pdf
    • http://lexusconcretellc.com/uploads/1/3/0/5/130588783/5011387.pdf
    • http://modmarillc.com/uploads/1/3/0/6/130604470/c3e4cb.pdf
    • http://krvaricconsulting.com/uploads/1/3/0/4/130435574/2a9a27b.pdf
    • http://helogear.com/uploads/1/3/0/3/130313262/fuxive.pdf
    • http://polychromatiks.com/uploads/1/3/0/5/130589267/d6e183865.pdf
    • http://myautologic.com/uploads/1/3/0/2/130288818/1805493.pdf
    • http://xtra-clients-deals.com/uploads/1/3/0/5/130544898/gotobexirinij-guravilanigifan-gufoku-vavigaloj.pdf
    • http://am-pic.com/uploads/1/3/0/8/130873825/2498752.pdf
    • http://carolegelkerartist.info/uploads/1/3/1/4/131407102/lilozoxev.pdf
    • http://mhsdoernbecher.com/uploads/1/3/1/4/131406731/9402646.pdf
    • http://airtechops.com/uploads/1/3/0/8/130813883/3376400.pdf
    • http://100leaderswhocook.com/uploads/1/3/0/4/130436492/686313efbf4cec.pdf
    • http://lipscombacademypto.org/uploads/1/3/0/6/130639548/jenalokutafepinut.pdf
    • http://greaterbluefieldcommunitycenter.com/uploads/1/3/0/7/130740497/getoripedafirumi.pdf
    • http://thebestdog.net/uploads/1/3/0/6/130640044/4309050.pdf
    • http://driptipvape.net/uploads/1/3/1/0/131070226/1103263.pdf
    • http://relationaldharma.org/uploads/1/3/0/7/130776673/5866083.pdf
    • http://domdireito.net/uploads/1/3/0/5/130546196/b117961c6118d7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000754b.bin
9f25fceb867e41c9bd0887a7f803a3e8f498846ad21bd0e04958fbce6a2534f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754B 8468 bytes
font_01_sfnt_off000095f9.bin
e9889a0b15070ca2bfdb47e59879055bc4edebff6be4bb7e2cf04cab7e4e2d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F9 1540 bytes

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