Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f1661c22579387…

MALICIOUS

PDF

30.3 KB Created: 2020-05-23 08:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b8dbe0a7c2bcb0437c355a7d5301486 SHA-1: 760807cb7736f07673bdcd62d7f13d16ef220bd3 SHA-256: 71f1661c22579387ef2a7fdaad99f980ecbbdc8c749262c1b74a52117e4df910
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links to other PDF files hosted on various domains. The document body, though heavily obfuscated, contains embedded URLs that are part of this link farm. The primary purpose appears to be SEO manipulation or distributing secondary payloads via these linked PDFs.

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://hostmaster.growglobalgroup.com/uploads/1/3/0/5/130544746/130544746.html#the+hunger+games+catching+fire+original+motion+picture+score
    • http://gigglewiggleyoga.com/uploads/1/3/1/4/131405965/7420151.pdf
    • http://leaninterviews.com/uploads/1/3/1/3/131398517/ridikewisurarun.pdf
    • http://kingkutzbarbershop.net/uploads/1/3/0/5/130590374/77ef6839c.pdf
    • http://mayovanhire.com/uploads/1/3/0/7/130738893/wepefugojunu.pdf
    • http://mtcraftycousins.com/uploads/1/3/0/2/130289580/0d53c6a5.pdf
    • http://univarsublease.com/uploads/1/3/1/8/131871499/xopivufezojum_vogizevemeledum.pdf
    • http://bizbestpractices.com/uploads/1/3/0/7/130775431/xosejup.pdf
    • http://alliedtradinginc.com/uploads/1/3/0/4/130488332/2039ecbfc6916.pdf
    • http://ivywildtavern.com/uploads/1/3/0/5/130550805/e231bc.pdf
    • http://thedailyelizabeth.com/uploads/1/3/0/2/130272267/roniwip.pdf
    • http://posh-tiques.com/uploads/1/3/1/4/131437669/ladutamewudukomena.pdf
    • http://1naz.org/uploads/1/3/0/3/130379528/dofepezenupakag.pdf
    • http://lebistrovietnameserestaurant.com/uploads/1/3/1/4/131453464/f1ba2aeec20.pdf
    • http://whm.tenny.biz/uploads/1/3/0/5/130588712/silifijurikajov.pdf
    • http://peachjamncaacoachpacket.com/uploads/1/3/0/6/130640125/rasozavisifokam.pdf
    • http://gulfshrimpretail.com/uploads/1/3/0/8/130813079/lizemawapapajor_wufufataxut_nawag.pdf
    • http://naptownlimos.com/uploads/1/3/1/3/131383575/cd13d143c.pdf
    • http://leighlennon.com/uploads/1/3/0/7/130738550/godobatuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c91.bin
a831807211caa33cb5cff9b6aabb393ed1c2d034e65f493d78fb29e7c7f50deb
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C91 9628 bytes