Malicious PDF — malware analysis report

Static analysis result for SHA-256 9680b3549b6588b6…

MALICIOUS

PDF

72.5 KB Created: 2021-06-05 16:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00953986a2c29eb8c78fd3f0e188e119 SHA-1: 01b5b8f4a51d70766d1ee08b4afb54ebee2d3766 SHA-256: 9680b3549b6588b63df3e3af27d32867fabd19a51d18ce540bb93bab188c9ee7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO spam campaign. The document body, though heavily corrupted, contains text related to budget proposals, likely serving as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://wastran.ru/pbw?utm_term=how+do+you+write+a+budget+proposal+sample
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/xakoxexubexigan.pdf
    • https://cdn-cms.f-static.net/uploads/4470685/normal_604ad2f60bb28.pdf
    • https://donasidavojixa.weebly.com/uploads/1/3/4/4/134494786/viraguxotu.pdf
    • https://cdn-cms.f-static.net/uploads/4469101/normal_604993f899ab4.pdf
    • https://static.s123-cdn-static.com/uploads/4383147/normal_5ff32780033b3.pdf
    • https://cdn-cms.f-static.net/uploads/4428083/normal_60285f882a150.pdf
    • https://tavutapakewig.weebly.com/uploads/1/3/5/3/135399939/tifisizivilutisopuxe.pdf
    • https://votaxejasusax.weebly.com/uploads/1/3/0/9/130969278/6891180.pdf
    • https://static.s123-cdn-static.com/uploads/4459325/normal_6002494bb36ec.pdf
    • https://static.s123-cdn-static.com/uploads/4465259/normal_5ff7b313321f0.pdf
    • https://cdn-cms.f-static.net/uploads/4380707/normal_60b98a9e6caa7.pdf
    • https://pixogupegitof.weebly.com/uploads/1/3/4/5/134592450/6405786a34.pdf
    • https://setojeduvesile.weebly.com/uploads/1/3/4/5/134587971/tiraxadusifobuvam.pdf
    • https://static.s123-cdn-static.com/uploads/4444647/normal_5ff5effd1a1d9.pdf
    • https://static.s123-cdn-static.com/uploads/4470964/normal_5ff6cf3473ac9.pdf
    • https://cdn-cms.f-static.net/uploads/4379987/normal_6064d36430f3d.pdf
    • https://cdn-cms.f-static.net/uploads/4484999/normal_60613c49adbfa.pdf
    • https://cdn-cms.f-static.net/uploads/4448547/normal_5fd678c03f17f.pdf
    • https://luliguruj.weebly.com/uploads/1/3/4/8/134879099/34f195.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc45fa57-c51f-4b71-95ed-e2563b990c95/wepuledutunujozi.pdf
    • https://uploads.strikinglycdn.com/files/c2948a71-edb6-4b8f-90de-5c434ebd7b65/99638723091.pdf
    • https://uploads.strikinglycdn.com/files/789c2ad5-0adc-46c6-8495-1866f98cd08d/sazoraxufip.pdf
    • https://uploads.strikinglycdn.com/files/19c126f0-fbe3-4ca2-ad4f-7d9d53eb4313/40306166240.pdf
    • https://uploads.strikinglycdn.com/files/05c481a3-c98a-4eb4-a76d-f18309bfd706/99840517334.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee5.bin
dea9a3f007054fe1d6ff1b5a68ea9665f2eddc5eeacf5da1e4f4b3a841025fe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 5572 bytes
font_01_sfnt_off0000f1d5.bin
589929ee3398791a717b53932bd0f3d76bbc3099f3fa42554a70357ade093698		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 10160 bytes

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