Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dbbb93b8582ed6…

MALICIOUS

PDF

75.0 KB Created: 2021-03-23 00:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56517ec187594770de4372d5104495a1 SHA-1: 8b05df9c5f0b4718abda95c83a7e4048414d593d SHA-256: a6dbbb93b8582ed682f56f64cea6adc230472b5a15a3346148e5c4f7e44b6515
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=how+to+start+an+argumentative+thesis+statement
    • https://nexakolaligu.weebly.com/uploads/1/3/1/8/131871479/4868553.pdf
    • https://cdn-cms.f-static.net/uploads/4462980/normal_5fd778f7b1269.pdf
    • https://niwapedikevamag.weebly.com/uploads/1/3/4/6/134691434/ribed.pdf
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fcf603f5e1fe.pdf
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/gugakomakofirivo.pdf
    • http://jixapijojuxev.iblogger.org/fupokawiloxegotivirapegob.pdf
    • https://cdn-cms.f-static.net/uploads/4391303/normal_6029967b14719.pdf
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/dipomader_jufotezaralomul.pdf
    • https://cdn.sqhk.co/vilosezuj/h7NPjgr/sapofufutizopovesi.pdf
    • https://cdn.sqhk.co/zozijawutuxu/Sagidic/xetijawuwa.pdf
    • https://static.s123-cdn-static.com/uploads/4450635/normal_60004551ec23a.pdf
    • http://xomafukokupu.iblogger.org/golixepasigazaruwetas.pdf
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/rekadikigomufu_xeramikomezuto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4cacf3b9-e9b1-47a0-813c-027e10c46f0b/best_careers_for_infj_personality.pdf
    • http://sejokuze.rf.gd/45749356732.pdf
    • http://ximigatoma.rf.gd/66175248791.pdf
    • http://wolosajubusina.epizy.com/samsung_6000_series_55_inch_led_smart_tv_manual.pdf
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_ba722bba7853451198e1aa52d99b1a85.pdf?index=true
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_46e0972f9a904e92af0cf76891446fed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5a3e4358-86c9-4fe0-8897-a82bd9b22896/81776116926.pdf
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_63ec43fbbe524be588db5560e6977431.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dba7939d-b55b-48e9-ad2a-9c8d25df8254/pathfinder_2e_new_races.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_off0000e89a.bin
b2d1fa514d0ecb1950c78b0c602fb58145b9a449776f3449fafe4d5c8aa9af89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5180 bytes
font_01_sfnt_off0000fa26.bin
77d9f292d4c4379990bf6c9156f6fc1332b92510f9e0facb112f8c5d331ae1cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 10496 bytes

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