Malicious PDF — malware analysis report

Static analysis result for SHA-256 934676d234a5d00e…

MALICIOUS

PDF

107.2 KB Created: 2020-05-20 08:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 066499417ec41d99ba0e6e1f6ad539b5 SHA-1: 23f15f188d65b4a56a0a8a8e49ff100df5161460 SHA-256: 934676d234a5d00e8df591c6caaf42c2c964b710ceb0f510be1b8b88ce04c3cb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files hosted on various domains. This technique is often used for SEO spam or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to redirect users. No scripts were extracted, limiting the ability to determine further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cogswell.info/uploads/1/3/1/8/131856725/131856725.html#%25D9%2586%25D8%25B7%25D8%25A7%25D9%2582+%25D8%25B3%25D8%25B9%25D8%25B1+%25D8%25AE%25D8%25A7%25D8%25AA%25D9%2585+%25D8%25A7%25D9%2584%25D8%25AE%25D8%25B7%25D9%2588%25D8%25A8%25D8%25A9 PDF link annotation
    • http://masterscalcutta.com/uploads/1/3/0/7/130738801/bowewivuvapetuf-vaben.pdfIn PDF document text
    • http://realearlgrey.com/uploads/1/3/0/2/130289558/nuzaz.pdfIn PDF document text
    • http://my-oac.com/uploads/1/3/0/7/130739817/405c720df.pdfIn PDF document text
    • http://kokoonmi.fr/uploads/1/3/0/7/130776082/wuwasagazoder.pdfIn PDF document text
    • http://rogerpatt.com/uploads/1/3/0/2/130287513/budulapotep.pdfIn PDF document text
    • http://startsafestaysafe.com/uploads/1/3/0/4/130490808/tekulet.pdfIn PDF document text
    • http://cwssalesservices.net/uploads/1/3/0/6/130621850/4696845.pdfIn PDF document text
    • http://eastonfamilyfun.com/uploads/1/3/1/3/131380582/nuxoziwob.pdfIn PDF document text
    • http://my805dogs.com/uploads/1/3/1/4/131483488/8569064.pdfIn PDF document text
    • http://santafestonecutter.com/uploads/1/3/0/6/130604113/c6078db81f06a.pdfIn PDF document text
    • http://mendhikabyd.com/uploads/1/3/0/5/130541688/3228142.pdfIn PDF document text
    • http://jdmservicecentre.ie/uploads/1/3/0/2/130272363/4049817.pdfIn PDF document text
    • http://dmcihomescebu.com/uploads/1/3/0/6/130604749/mavolirema.pdfIn PDF document text
    • http://red11leader.com/uploads/1/3/0/6/130604091/45b9fd63f5be74.pdfIn PDF document text
    • http://residencecamelia.com/uploads/1/3/0/5/130551198/b39af92e7cea7a.pdfIn PDF document text
    • http://qualityprotoday.com/uploads/1/3/0/6/130620585/1169100.pdfIn PDF document text
    • http://allcityclothingco.com/uploads/1/3/0/2/130287735/ponizedasi.pdfIn PDF document text
    • http://bondingthedots.com/uploads/1/3/0/6/130639059/nutadodezejam.pdfIn PDF document text
    • http://cinnamonrabbitbreeders.com/uploads/1/3/1/4/131437677/fenalaludedowulu.pdfIn PDF document text
    • http://ikinsit.com/uploads/1/3/0/9/130969166/pezidigabuzuje-kakelewule.pdfIn PDF document text
    • http://smokymos.com/uploads/1/3/1/6/131606228/8987143.pdfIn PDF document text
    • http://johnjuric.com/uploads/1/3/1/3/131379168/4632905.pdfIn PDF document text
    • http://grenadabla.org/uploads/1/3/1/8/131855981/db49a3a99894e.pdfIn PDF document text
    • http://sloanebooks.com/uploads/1/3/1/4/131438443/2897029.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 3

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000144a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x144A5 33728 bytes
SHA-256: e1e6f3afddf5639ff9df3090c3ed3e2736ff8104ecad759b1006bb1fe9949eef
font_01_sfnt_off00017e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E11 9200 bytes
SHA-256: 5ec1b311130c67b2cfee0ce47e3c1a543879a11cd1f51f2492a3ed0b3a00a446

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