Malicious PDF — malware analysis report

Static analysis result for SHA-256 0767cf37ab200e1e…

MALICIOUS

PDF

38.1 KB Created: 2020-05-14 11:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7f23fe0bde23d260e446db937100a2da SHA-1: 34889ea047d632ad21bc365f9ef7f8deb326ed33 SHA-256: 0767cf37ab200e1e351690f2afb4e90f78a75ca582c125914b36e24309a6816e
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the sheer volume of outbound links suggests a coordinated effort to redirect users.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://usbca.ca/uploads/1/3/0/2/130289333/130289333.html#plot+axes+matlab+guide
    • http://thetinycontainerhome.com/uploads/1/3/0/8/130813851/gebapewoxijapi_xugarela_xirinajedatu_pigenazobuno.pdf
    • http://sflatu.com/uploads/1/3/0/8/130815014/eb55f3f155344a.pdf
    • http://trinki.be/uploads/1/3/0/5/130551338/jabiruxizetemig-dakow-mafen-korasuwavumoxa.pdf
    • http://rizamia.net/uploads/1/3/1/6/131637273/50f000a2efa1.pdf
    • http://beautyimpressions17.com/uploads/1/3/1/6/131606984/xedukuberilabozesim.pdf
    • http://yunago.org/uploads/1/3/0/5/130589334/zaxatuvevewure-xowaf-vazudilufuj-pamemagudoradal.pdf
    • http://emilycorona.com/uploads/1/3/0/7/130738764/d37408ebc2e.pdf
    • http://caravanadoamor.org/uploads/1/3/1/6/131636654/e1bf36caa.pdf
    • http://footy.tours/uploads/1/3/0/6/130603931/jugiteginega.pdf
    • http://savymommas.com/uploads/1/3/0/8/130814133/xedali.pdf
    • http://cellgenetherapy.com/uploads/1/3/0/7/130776439/sipuponifopev.pdf
    • http://ajgittnerprocessequipment.com/uploads/1/3/0/5/130590208/xavoko.pdf
    • http://gurugill.com/uploads/1/3/0/6/130603937/5152c5ac3.pdf
    • http://lrdlst.com/uploads/1/3/0/9/130969446/musib.pdf
    • http://diypoolsoftexas.com/uploads/1/3/1/3/131379546/da327204ad90.pdf
    • http://descansolapaloma.com/uploads/1/3/0/6/130621349/d49fd420.pdf
    • http://abbythomas.wedding/uploads/1/3/0/5/130539935/bawibunatubak_mofon_tepuxesamed.pdf
    • http://monzepm.com/uploads/1/3/0/4/130435590/5636119.pdf
    • http://agelesssav.com/uploads/1/3/1/4/131438539/pijetuwegijijopugi.pdf
    • http://lakshmananand.net/uploads/1/3/1/3/131381021/8679223.pdf
    • http://aboriginalamericanwomensociety.org/uploads/1/3/0/7/130740627/628277.pdf
    • http://notostraws.com/uploads/1/3/1/3/131384289/gebexuporis.pdf
    • http://themountaintopjournal.com/uploads/1/3/0/8/130813478/5937270.pdf
    • http://laurellakesdentist.net/uploads/1/3/1/6/131606252/18ffaed7ea969c.pdf
    • http://flymoss.com/uploads/1/3/0/2/130288492/6128913.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_off000065e8.bin
1757e5340565cc91230304717b8cfa23a3a1b53faf9538b8c3ebf5387b18fa68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E8 11104 bytes

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