Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf335ade95673ad…

MALICIOUS

PDF

81.2 KB Created: 2021-05-19 20:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2847770fe24304bdb7c4522882ff0bc SHA-1: 45112851903556a9e4dc2a2a0480cf0f887fc952 SHA-256: 8bf335ade95673ad1afe72c1d751607a6073cf243470176e6e74d1eff40653da
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 pointing to Weebly and other hosting services, suggesting a link farm or phishing operation. The primary URL appears to be a lure related to game crafting recipes, likely to entice clicks. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, possibly involving JavaScript execution to facilitate the redirection to these numerous external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=terraria+how+to+get+more+crafting+recipes
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/56a85401.pdf
    • https://petabururumeje.weebly.com/uploads/1/3/4/9/134902787/0d019.pdf
    • https://cdn-cms.f-static.net/uploads/4457320/normal_603ed17de67f7.pdf
    • https://cdn-cms.f-static.net/uploads/4416798/normal_60288b3e269fb.pdf
    • https://cdn-cms.f-static.net/uploads/4494681/normal_603b7f50e7fd8.pdf
    • https://cdn-cms.f-static.net/uploads/4410679/normal_602900b15e7fb.pdf
    • https://cdn-cms.f-static.net/uploads/4374522/normal_604812c89fcc4.pdf
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/xipepobuwepudirag.pdf
    • https://vakumijajuxos.weebly.com/uploads/1/3/4/4/134465568/buwovabamozujuvuxiku.pdf
    • https://cdn-cms.f-static.net/uploads/4427076/normal_6017be314a37a.pdf
    • https://cdn-cms.f-static.net/uploads/4506063/normal_605720c8eb9ab.pdf
    • https://cdn-cms.f-static.net/uploads/4374853/normal_605ba69393c73.pdf
    • https://waramexebogod.weebly.com/uploads/1/3/1/8/131856917/9716580.pdf
    • https://cdn-cms.f-static.net/uploads/4484610/normal_6056b9cc47f52.pdf
    • https://bilukejax.weebly.com/uploads/1/3/5/3/135392742/8145348.pdf
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5fcdb2e55b680.pdf
    • https://cdn-cms.f-static.net/uploads/4369158/normal_602e3b4d3a0d2.pdf
    • https://static.s123-cdn-static.com/uploads/4416919/normal_60054cf020712.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5af672fd-a453-410e-8d60-b4fbf3829f03/femuboxamabumifizikexif.pdf
    • https://uploads.strikinglycdn.com/files/69c8e5c8-b81e-4132-819e-bfb280da8811/pentair_intellichlor_ic60_flow_switch.pdf
    • https://uploads.strikinglycdn.com/files/a8860fe4-7400-4161-87e1-0d44357b37c6/why_is_my_beats_mic_not_working_on_ps4.pdf
    • https://uploads.strikinglycdn.com/files/f320f601-5364-4598-bc1d-54d5d52735d7/used_thermo_king_parts_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/6e944443-235a-4be0-96e2-39df4788a716/jandy_error_code_120.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f308.bin
b41a144240b701b31f6654ed46f6ac63906e79b902c298090647e6be1b43b7dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 5228 bytes
font_01_sfnt_off000104bd.bin
65965dad77b4a1ef7102d75ac03dfb11ad606391f63cfa3cf5f5061818a058a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 10580 bytes
font_02_sfnt_off00012927.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 4324 bytes

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