Malicious PDF — malware analysis report

Static analysis result for SHA-256 1516e4a3943fbc37…

MALICIOUS

PDF

76.1 KB Created: 2021-03-24 09:28:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8621f8aca39716bf640ea8a3bf91b4ce SHA-1: e6a1bccc92eb6790e27d026839e9b5be83b2743c SHA-256: 1516e4a3943fbc37d5467cea519ac661fabbeca73c588a61b32fdf0b4a761b7c
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic, along with numerous external URLs, suggests a tactic to distribute or link to further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=print+pdf+brochure+double+sided
    • https://mugebixivezir.weebly.com/uploads/1/3/1/4/131484268/9dd9e.pdf
    • https://cdn-cms.f-static.net/uploads/4369645/normal_602f60384c1d9.pdf
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5fc710d300c56.pdf
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/bigasavaxagolatisow.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/9982110.pdf
    • https://cdn-cms.f-static.net/uploads/4372753/normal_6058f0c3eeb14.pdf
    • https://cdn-cms.f-static.net/uploads/4501204/normal_6018d2d132600.pdf
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5fe187eec2fae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dosenivejadapi.rf.gd/60948022740.pdf
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_b95c94cc2c73469bbfb30df8473ed2de.pdf?index=true
    • https://5c51e3d7-2896-491e-a255-1b002e356b93.filesusr.com/ugd/5b6ce5_dbf65f9687ac458985a8bb528db5d950.pdf?index=true
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_d651e356d0ac45a3a28bc03ee1ed5dd5.pdf?index=true
    • https://s3.amazonaws.com/sepawi/32685620829.pdf
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_a0ac42f1743c4dd9b0074ffe3cb8d9df.pdf?index=true
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_09330ff5521143ec816f14beb614dc38.pdf?index=true
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_8033d1cce51f4fb88150013a3931550d.pdf?index=true
    • https://s3.amazonaws.com/pevuwarobuvowa/gudamix.pdf
    • http://wowinagapujepok.epizy.com/how_to_pair_my_samsung_soundbar.pdf
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_eeefb23c67b24a449408d37366a046c1.pdf?index=true
    • 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_off0000ec0f.bin
45e51769eb2fdf92e6ee8a47764e6493fac487207d6f3c17f6f99e490bdf1da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 5172 bytes
font_01_sfnt_off0000fd9f.bin
caec8c45615d22034b7d241f38f2dd7e05c47a908d2c8b20007e88be1f74a434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 11120 bytes

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