Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3532701810680d…

MALICIOUS

PDF

33.2 KB Created: 2020-05-15 22:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 5173d2d141ebf5d534970b87c5ea12e1 SHA-1: 4e7942ac1a6751c9de9a462e7cb9f7589821d1fc SHA-256: 4a3532701810680db97c100698621ed6a84fff0998714ff507928bf698b5d3f0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or content distribution network. The document body contains a mix of seemingly unrelated text and the embedded URLs, further supporting the link farm hypothesis. No scripts were extracted from this sample.

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://wislar.org/uploads/1/3/1/8/131858661/131858661.html#punjabi+breakup+sad+song PDF link annotation
    • http://silvercapitalllc.com/uploads/1/3/0/6/130604056/5e20b00a22d3.pdfIn PDF document text
    • http://crosspar.net/uploads/1/3/0/2/130272283/2608677.pdfIn PDF document text
    • http://nebraskachambers.org/uploads/1/3/0/8/130813362/31132c.pdfIn PDF document text
    • http://popscustomcabinets.com/uploads/1/3/0/7/130776133/3462363.pdfIn PDF document text
    • http://dbkstaging.com/uploads/1/3/0/5/130543006/jojisatulaxakuf-duvowakalovad-kegakekoz-junasisuvisep.pdfIn PDF document text
    • http://dtoparts.com/uploads/1/3/0/7/130739575/626f2897536f648.pdfIn PDF document text
    • http://rex-build.com/uploads/1/3/0/6/130639481/mirevifozuved_mebago.pdfIn PDF document text
    • http://truthinstory.com/uploads/1/3/0/4/130483830/8b4b8965b75cb.pdfIn PDF document text
    • http://paintingwithcindy.com/uploads/1/3/0/5/130539774/zepasisure_dutamugofoj_tunefirajesug_dukobido.pdfIn PDF document text
    • http://nationalcasinomarketing.com/uploads/1/3/0/8/130814200/633e17225ff1.pdfIn PDF document text
    • http://dinner-ateight.com/uploads/1/3/1/3/131383931/sizukibanenajix.pdfIn PDF document text
    • http://tradergreat.net/uploads/1/3/0/3/130379824/3827109.pdfIn PDF document text
    • http://infralinx.org/uploads/1/3/0/9/130969679/sazutovopasidaxex.pdfIn PDF document text
    • http://saretacusleau.com/uploads/1/3/0/7/130776718/1283934.pdfIn PDF document text
    • http://5210clallam.org/uploads/1/3/1/6/131637503/ca760a4504ee.pdfIn PDF document text
    • http://krystalbiijoux.com/uploads/1/3/0/6/130620982/3b99f022907ce.pdfIn PDF document text
    • http://ibrafertil.com/uploads/1/3/0/4/130483207/nudowodiladixinolus.pdfIn PDF document text
    • http://radicalconceptsaz.com/uploads/1/3/1/4/131438571/8956160.pdfIn PDF document text
    • http://cut50summit.org/uploads/1/3/0/8/130814085/verufedukenekaju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5748 9892 bytes
SHA-256: 418a285f0e252fdf2ed238dcca06c6b15af7033aa6647370eb047280ab531e39

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