Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2523b10c0336a2…

MALICIOUS

PDF

70.0 KB Created: 2021-05-03 03:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 284812926f3934ec5bd1f4ea07ba3424 SHA-1: 87e6773f532587a752976fdedebd772e17617629 SHA-256: 8c2523b10c0336a2c999cba486349e0010d68f610189098f6b86f1c2c9d7450a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism designed to lead users to malicious content. The embedded URLs, such as 'https://dafemum.ru/strik?utm_term=how+much+do+lab+techs+make+an+hour', are likely part of this malicious infrastructure.

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://dafemum.ru/strik?utm_term=how+much+do+lab+techs+make+an+hour
    • https://cdn-cms.f-static.net/uploads/4501503/normal_5fdaf06f63d34.pdf
    • https://cdn-cms.f-static.net/uploads/4376096/normal_6041ee5e4d761.pdf
    • https://cdn-cms.f-static.net/uploads/4419236/normal_605a72592c4d7.pdf
    • https://static.s123-cdn-static.com/uploads/4368493/normal_6007c214d92bf.pdf
    • https://cdn-cms.f-static.net/uploads/4481409/normal_60485c965544f.pdf
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/bimelugudak.pdf
    • https://cdn-cms.f-static.net/uploads/4368238/normal_6063546dc027d.pdf
    • https://cdn-cms.f-static.net/uploads/4444866/normal_60663262d6b11.pdf
    • https://static.s123-cdn-static.com/uploads/4450641/normal_5fffa2a4d5cd2.pdf
    • https://vujipobunovopo.weebly.com/uploads/1/3/5/3/135324227/3f80e59.pdf
    • https://bunofavaluz.weebly.com/uploads/1/3/4/6/134661637/7757902.pdf
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/023d34e641.pdf
    • https://pegigisujojefuf.weebly.com/uploads/1/3/1/4/131413718/kusifisigazazego.pdf
    • https://static.s123-cdn-static.com/uploads/4530457/normal_5ffbafdd10954.pdf
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/a412c70be1.pdf
    • https://xutobegepoxebax.weebly.com/uploads/1/3/5/3/135333125/kazoda_ninolisama.pdf
    • https://sibuzowad.weebly.com/uploads/1/3/2/8/132814892/budovudikuzif_vejuzipomo_dobax.pdf
    • https://sizikipumaxa.weebly.com/uploads/1/3/0/7/130739349/netosufateve_gopixetula_xevutatomotilid.pdf
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/c4d8b27ea.pdf
    • https://movimuwetimegi.weebly.com/uploads/1/3/4/3/134342740/sunowoxurelike_wabevezoge_dates.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://temiruxol.epizy.com/biographical_sketch_sample.pdf
    • http://zevuketeno.rf.gd/bodybuilding_chest_workout_videos.pdf
    • http://nizifewinuli.epizy.com/seoul_subway_map_download.pdf
    • http://nerepigov.rf.gd/9975025816.pdf
    • http://bupomejov.epizy.com/69487619483.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_off0000d515.bin
165acea739003b4a6162c0f7f5f29800929462b27a02f37cce2bce759365f552		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 5436 bytes
font_01_sfnt_off0000e76e.bin
89b38cc70d744d799376aa6bcc3ed58ffae979e860e4e1755694e9a2049cfa6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 10236 bytes

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