Malicious PDF — malware analysis report

Static analysis result for SHA-256 564df230d292c4cc…

MALICIOUS

PDF

96.6 KB Created: 2021-03-31 04:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f3143984d013222465e41339b78ef801 SHA-1: 57ecd166ee2bf433a6f0fdb32613b7e70d7f445c SHA-256: 564df230d292c4cc067956f64c874e41175d3999f82293cbe8f4294491a7e14b
252 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics, including a critical finding for malicious redirector links and a link farm structure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain junk data, but the presence of numerous embedded URLs, including one pointing to known malicious infrastructure, suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=what+can+i+do+with+a+phd+in+english+literature In PDF document text
    • http://businessmentality.com/vegetarian_cookbook_free_downloadopxsu.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450636/normal_604244abf12c1.pdfIn PDF document text
    • http://wtia.space/dugopaburudewes2wn06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_6061f83a784bb.pdfIn PDF document text
    • https://cdn.sqhk.co/ninazixador/Bhdnhfa/78915147901.pdfIn PDF document text
    • https://cdn.sqhk.co/didirepakavi/Rb5ifge/lego_hidden_side_ghost_train_express_70424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_6019c88cdedab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499972/normal_6047af1b2b574.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/gUKRsPD/answer_back_to_me.pdfIn PDF document text
    • http://dvigatel.guru/volos_guide_to_monsters_playable_racesuqy8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_6047a7dc91395.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/2oKMjcz/44506423538.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/givajarivasenosozunepofeycvan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_60532bff21d0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/savifin/64329920606.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_f3684fc2ac2c4c398fed46f12b8d3596.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezutu/binipefamisikubafib.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_828a8487c1d047dd976f2ae8286cf33e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/tv_guide_hobart_monday.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/99657358213.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/kasarian_ng_pangngalan_grade_1_worksheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4F 5320 bytes
SHA-256: 5955d310fcb4cce35353a2aed0adc0f78125113f3b111553f5700aa4ed3c79c4
font_01_sfnt_off00014070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14070 11148 bytes
SHA-256: 1e08424bea333f5dcc16381dcbfab77ef51493ad6a58fb3104f9dd98d8b9bbe3
font_02_sfnt_off00016642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16642 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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