Malicious PDF — malware analysis report

Static analysis result for SHA-256 058cc0ec7f162fe8…

MALICIOUS

PDF

64.8 KB Created: 2020-04-09 14:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8cdc93f4f0d8c1ad1baa3902f56f3562 SHA-1: a439b31d752c253071bfb6d83a742b9abb5242e7 SHA-256: 058cc0ec7f162fe8bfa1c4265b27fe1b8f55c8bcaaf6205108849e3fcf1d2208
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, presenting numerous external PDF links designed to deceive users into downloading further malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, with the primary URL being http://lyfelinescertificationandstaffing.net/uploads/1/3/0/6/130639404/dixitixojobodajaf.pdf. The presence of 'SE_PASSWORD_ARCHIVE_LURE' suggests that the document may also instruct users to decrypt or access password-protected archives, a common tactic to bypass security scanners. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nutrizionistagiuliaporcu.it/uploads/1/3/0/5/130550756/130550756.html#ordenacion+del+territorio+definicion
    • http://lyfelinescertificationandstaffing.net/uploads/1/3/0/6/130639404/dixitixojobodajaf.pdf
    • http://outofthenightjourney.com/uploads/1/3/0/6/130621160/4aa59bd6e.pdf
    • http://ctaincnc.com/uploads/1/3/0/7/130739318/040ad30a08b4b.pdf
    • http://indigorealms.com/uploads/1/3/0/6/130640162/7397406.pdf
    • http://noevalleycontemporary.com/uploads/1/3/0/2/130291939/fujeguso-zewajovimem.pdf
    • http://expressrelocators.com/uploads/1/3/0/6/130639147/mipabun-karum-pukowe-moketadiluxufas.pdf
    • http://quantumfrequencyai.com/uploads/1/3/1/0/131070559/5831924.pdf
    • http://barkproper.com/uploads/1/3/0/4/130476575/9641147.pdf
    • http://marketplaceposting.com/uploads/1/3/1/0/131069899/67a9d.pdf
    • http://clkdesign.ca/uploads/1/3/0/2/130289332/degelalafakosi.pdf
    • http://winefestmv.com/uploads/1/3/0/4/130483875/3431827.pdf
    • http://logoless.net/uploads/1/3/0/7/130775071/7968551.pdf
    • http://moonandbackministries.com/uploads/1/3/1/4/131407742/negusativu_navivo.pdf
    • http://mkrishnan.org/uploads/1/3/0/4/130476158/biposesapapisoxeb.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_off0000d4ac.bin
bcc0b290978aa941bd3e52e09707417a0756f241b73c4e504926888d1c96e165		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 9288 bytes

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