Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b701a65cb9d9322…

MALICIOUS

PDF

31.2 KB Created: 2020-03-23 17:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3282028c37c985f7320718891985bf9f SHA-1: a8c28b39c916ec07477895ccf37d20f923073519 SHA-256: 1b701a65cb9d9322856ea129d2640a217092bc2f87a24ca1d85a9f0a05792714
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially garbled, contains references to URLs that are part of this link farm, suggesting a coordinated effort to distribute content or manipulate search engine results through a large number of linked PDFs.

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://askjj.me/uploads/1/3/0/2/130287502/130287502.html#iron+2+ammonium+sulfate+hexahydrate+msds
    • http://spam.aerodromes.com/uploads/1/3/0/8/130813798/puvijowunabojen_sozefekokokeze.pdf
    • http://loungesevenzeroeight-photo.com/uploads/1/3/0/7/130739926/loliwowaweloxawim.pdf
    • http://dididothat.net/uploads/1/3/0/6/130621167/0f2607.pdf
    • http://slumber.blog/uploads/1/3/0/8/130814967/wixajilo.pdf
    • http://bostongoldbuyer.com/uploads/1/3/0/5/130551064/e633c892a1caa.pdf
    • http://www.spavii.com/uploads/1/3/0/3/130324351/zizupiwakafotekes.pdf
    • http://tahoenaturecenter.com/uploads/1/3/0/7/130776205/bca0dd8920a6e.pdf
    • http://cleanadvantageprogam.com/uploads/1/3/0/5/130589362/805e6.pdf
    • http://jeffjeffers.com/uploads/1/3/0/3/130323952/wolafatotobap-kedifofosunomax-sezopig-titizesenenokar.pdf
    • http://mrlsart.com/uploads/1/3/0/6/130604509/5b49095eb24b.pdf
    • http://ariens-technicalservicesltd.com/uploads/1/3/0/7/130740420/ruxuzosiwak_vimakeladamabo_zusomexoseku.pdf
    • http://xinli18luckbeiyong.f18.ebkf.org/uploads/1/3/0/8/130814209/ruzojedufebuman-bamag-rumizegadutilid-faliwipexij.pdf
    • http://www.djjeremiah.com/uploads/1/3/0/6/130621803/1881803.pdf
    • http://stanfordstudentactivities.com/uploads/1/3/0/8/130874393/vatarolewew.pdf
    • http://www.forelisafashion.com/uploads/1/3/0/3/130379894/wipev-wogaxoxibad-fevumewotunum.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_off0000558d.bin
23311f54d04aa94684908cfa89e00f99aafb353d2b0255706da2d4ea74234a7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x558D 6352 bytes

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