Malicious PDF — malware analysis report

Static analysis result for SHA-256 3961d3efc867981f…

MALICIOUS

PDF

83.7 KB Created: 2021-05-23 03:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4d2db904c36627d16b53d583daeade8b SHA-1: 47cd0f840b532f8a465b97803929a8fa40d14b03 SHA-256: 3961d3efc867981f13e4829a0493a7e5825df3c691b0b7ed88206a1257f0dba4
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm with multiple disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'SE_MFA_LURE' indicates the document is designed to harvest credentials or session tokens by mimicking a multi-factor authentication prompt. The presence of external URIs and a link farm points towards an attempt to redirect the user to malicious sites, likely to download a second-stage payload or phish for credentials.

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
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://dugedepap.ru/strik?utm_term=example+of+how+to+fill+out+a+cms+1500+claim+form PDF link annotation
    • https://didipovewefof.weebly.com/uploads/1/3/4/3/134306756/watitixaxojidizisoxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379498/normal_5fe289f087eb3.pdfIn PDF document text
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/wedep_mizebafabezabow_buxex.pdfIn PDF document text
    • https://lexobazotukagof.weebly.com/uploads/1/3/1/4/131407042/jefuforobeboxut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_6041c00eef0fd.pdfIn PDF document text
    • https://mojetene.weebly.com/uploads/1/3/5/9/135957439/884a0dfb5fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_5fd84e2b7ec87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_600c8ff4ca7fd.pdfIn PDF document text
    • https://sugelama.weebly.com/uploads/1/3/4/8/134898925/6823816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_601ebde7ba5e7.pdfIn PDF document text
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/sajilozavolijaruzasa.pdfIn PDF document text
    • https://josujobo.weebly.com/uploads/1/3/4/7/134713906/09df9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_6038d531bfe58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_6047b64dd6d43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366973/normal_5ffe65e1dcb8e.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/wowoxijugepu.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/1379803.pdfIn PDF document text
    • https://nusewumu.weebly.com/uploads/1/3/2/7/132740482/pewobazisa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e5caf1-e04e-4813-9aab-11c35f8a7bfe/how_did_anglo_saxons_bury_their_dead.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a43371-aeb5-4e4e-a450-02305d9e8ef9/vulel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e5817e-288e-4b22-b8df-06604af0c8c6/football_manager_handler_2015_best_players.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1386ba-58d1-459a-9e83-58c7e9ed48bd/bobofexum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6bd58b-e55f-42bf-ad3d-f418dfeb2162/onkyo_tx_nr616_wifi_adapter.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 5692 bytes
SHA-256: 061670359ee1d7916fe6d9101efa847109e4ca8703f9d64ca859773b695d3f5b
font_01_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 10964 bytes
SHA-256: 6c5dd1010ba6b3d047b9b1144243f696ecbf1aa8522f0cbc081d79407a9c34d7

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