Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee75e6e5e8e42c6…

MALICIOUS

PDF

79.8 KB Created: 2021-03-30 05:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1212642d6aa657ac94e0f73c13036ccc SHA-1: 83bdf2c98d56534375a716874c10de940fdf5728 SHA-256: 4ee75e6e5e8e42c6fa35149491a2970864d0a7a85d2a87c3a425525147242f2a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to disposable domains. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or distributing malware. The document body, though heavily obfuscated, contains text related to home warranties, suggesting a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=will+a+home+warranty+replace+an+old+ac+unit
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/vagip.pdf
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5fdde71c28a46.pdf
    • http://silekutum.medianewsonline.com/isometric_dot_paper_printable.pdf
    • https://tidufafedufokaj.weebly.com/uploads/1/3/4/6/134693038/8d16540405.pdf
    • http://bikejesoxatelo.mygamesonline.org/gojumik.pdf
    • http://vatetuda.scienceontheweb.net/22284782065.pdf
    • https://cdn-cms.f-static.net/uploads/4501660/normal_6055d01fef08b.pdf
    • https://vavaxurose.weebly.com/uploads/1/3/0/7/130775274/vofumaxasona.pdf
    • http://zuregazezoral.mygamesonline.org/canto_nuevo_camino_neocatecumenal_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4451574/normal_602e36205d861.pdf
    • https://wonuraje.weebly.com/uploads/1/3/5/9/135983109/6740881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/489e443c-36de-49c2-9aa7-b03f6338862c/mujavukimexevip.pdf
    • https://uploads.strikinglycdn.com/files/38e9649f-74c5-48ac-a152-f1f07c488079/elgato_hd60s_power_requirements.pdf
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_11987eb1309e4cef9f41a08838b39801.pdf?index=true
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_4dd1e48f27cf42ddbe886872fa2f49f8.pdf?index=true
    • http://fuwutowamig.myartsonline.com/pinopoverojomov.pdf
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_c4aa336d027d4e5e80d540c2908da962.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0a.bin
e03180cb7ed565d5d1eee3b00734c5d67ee739830fc928bd152b207509147f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 5224 bytes
font_01_sfnt_off0000feb5.bin
15df2feae6087ba70700ac8bd7c473fb758f4ff28c059bd4ea38b1f780ee8d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10972 bytes
font_02_sfnt_off000123ae.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 4324 bytes

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