Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b55c349841bd6bc…

MALICIOUS

PDF

65.6 KB Created: 2020-06-05 10:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f22e1e5d2bf27a77ef29298d170e8494 SHA-1: 8a08c573f347e64cf1c77702e48cdd0a279cd88b SHA-256: 3b55c349841bd6bce21d9ccfe7e0ad21315006341801b7b94166252e92ab601f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, identified as a link farm, suggesting a tactic to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious. The embedded URL 'http://adsl-63-204-18-30.benefitplans.org/uploads/1/3/1/4/131406379/131406379.html#sasori+of+the+red+sand' is a primary indicator of the malicious destination.

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://adsl-63-204-18-30.benefitplans.org/uploads/1/3/1/4/131406379/131406379.html#sasori+of+the+red+sand
    • http://controlledchaosdogsledracing.com/uploads/1/3/0/6/130605275/gebovi-watapoforut.pdf
    • http://clockrepairalpharetta.com/uploads/1/3/0/5/130551390/6138753.pdf
    • http://fruitgumes.com/uploads/1/3/1/4/131437383/1386579.pdf
    • http://webmail.warnergaragedoor.com/uploads/1/3/0/2/130273752/bumozomuvaxano.pdf
    • http://mx.appealforcourage.org/uploads/1/3/0/7/130740251/89a076c3c.pdf
    • http://sdui.org/uploads/1/3/0/7/130739705/a2dd1583b026.pdf
    • http://bueeredangus.com/uploads/1/3/0/5/130588405/tebikori-sulebipu-runolulaje-zoveg.pdf
    • http://suewestonphysio.com/uploads/1/3/0/5/130543035/rupegepa-nupasefaxazif.pdf
    • http://ns2.bermo.com/uploads/1/3/1/8/131856408/nuxamud-sowamaramenubo-baxosos-vigemex.pdf
    • http://12taste.net/uploads/1/3/1/3/131379014/vujevij-bodavu-libote-momaxajud.pdf
    • http://timelessfinds.net/uploads/1/3/0/4/130478374/zobamuteliwed-zafedejipomir-pifixutuwugaj.pdf
    • http://trainingoptions.org/uploads/1/3/0/2/130289620/xumotofanig.pdf
    • http://adsl-63-204-18-30.benefitplans.org/uploads/1/3/1/4/131406379/terms.html
    • http://adsl-63-204-18-30.benefitplans.org/uploads/1/3/1/4/131406379/dmca.html
    • http://adsl-63-204-18-30.benefitplans.org/uploads/1/3/1/4/131406379/policy.html
    • https://lejobadoni.files.wordpress.com/2020/06/kuzixirogagokepefabuki.pdf
    • https://bosomod.files.wordpress.com/2020/06/18711892977.pdf
    • https://lakuvipejuz106751964.files.wordpress.com/2020/06/963103150.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4c7.bin
fda2a97313cb7b2da93e9f29e8a930e63e6a4c9501ee349b6f0cbfa47498de84
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C7 4876 bytes
font_01_sfnt_off0000d5dd.bin
d2bbfce05f50ed4adfb3842f7be880e53d7b23f4b21c382ff8d3919a29b80b6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 10844 bytes