Malicious PDF — malware analysis report

Static analysis result for SHA-256 016790c235612a7d…

MALICIOUS

PDF

91.4 KB Created: 2020-04-11 08:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aec15b83a4f0a856212f62b18e3b89db SHA-1: 64236e24ae6af2932319b284f0aa39d6b5c891b0 SHA-256: 016790c235612a7db801ece715c3321ce618c6bbf268ce04a2d56ddd47fd6971
136 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, a technique often used to create link farms or redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of algorithmically generated URLs further supports a malicious intent, likely for content delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://74-123-76-25.mgwnet.com/uploads/1/3/1/1/131164239/131164239.html#their+eyes+were+watching+god+full+book
    • http://melsellsparadise.com/uploads/1/3/0/4/130435909/jiwujasofikogav.pdf
    • http://tropicaloilandgas.com/uploads/1/3/0/2/130289019/toloze.pdf
    • http://mesaroofrepairs.com/uploads/1/3/0/6/130604785/fotitavudekiziko.pdf
    • http://memoriesinsoap.com/uploads/1/3/0/3/130313186/jazoritur.pdf
    • http://usdepartmentofrecovery.net/uploads/1/3/0/6/130621306/rexunovojepaxewozanu.pdf
    • http://victoryamecaz.org/uploads/1/3/0/8/130874648/gabofuxetafino.pdf
    • http://healthycalabash.com/uploads/1/3/1/4/131454656/zidazifagiziriti.pdf
    • http://professionalcleaningservice.net/uploads/1/3/1/4/131406300/9320418.pdf
    • http://sierrasun.ca/uploads/1/3/1/6/131637092/6617793.pdf
    • http://peakparenting.org/uploads/1/3/0/8/130873715/4913900.pdf
    • http://africandiasporarepatriationinitiative.org/uploads/1/3/0/5/130590162/letotegat_rogaja_zumetuvogumaruz.pdf
    • http://playersshack.com/uploads/1/3/1/4/131455825/dezivek.pdf
    • http://consumingglory.com/uploads/1/3/0/4/130476346/a4d0db.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_off00013f91.bin
0839ef6257032552c2ad324502df9e695b055f87598bdb7185381cfe12902ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F91 8824 bytes

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