Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1ec4b97798e6af…

MALICIOUS

PDF

78.6 KB Created: 2021-03-19 10:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dae249b03bd6a1f219922d79937c468c SHA-1: 5b660baab953bbe0bf160599a6c7009ea41b1c3d SHA-256: df1ec4b97798e6af87f1be688bb96ce7014db9cd9b20aa98dbef77141297269c
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. The 'SE_MFA_LURE' heuristic indicates it likely attempts to harvest credentials or abuse multi-factor authentication. The presence of numerous external links, including one pointing to 'dafemum.ru', suggests it may lead to a malicious website or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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
  • 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/123?utm_term=bharat+gas+subsidy+application+form+pdf
    • https://cdn.sqhk.co/xawefigi/iejggcl/zizuwovovugeku.pdf
    • https://cdn-cms.f-static.net/uploads/4366369/normal_6038ead4225d3.pdf
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fc695fb36c8c.pdf
    • https://cdn.sqhk.co/sesizame/bficRxs/herpes_simplex_1_cold_sores.pdf
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdf
    • https://cdn.sqhk.co/mugolino/ieKeIhi/34395291058.pdf
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/rovojafopogolawewis.pdf
    • http://dosubodanes.mypressonline.com/are_cast_iron_weights_safe.pdf
    • https://cdn-cms.f-static.net/uploads/4411491/normal_60146dbf3089d.pdf
    • https://cdn.sqhk.co/pawekenu/hadjcgj/jojegezenitanovitajepe.pdf
    • http://tinipen.medianewsonline.com/bavumaxinodorufu.pdf
    • https://niwurepezexeted.weebly.com/uploads/1/3/5/3/135312419/a5df6c.pdf
    • https://zabagazepag.weebly.com/uploads/1/3/4/4/134498959/fedolesikido.pdf
    • https://kutinimi.weebly.com/uploads/1/3/4/6/134608846/konavon-zurogopomufine-kejuwudaseb.pdf
    • https://cdn.sqhk.co/goganededem/gHO3ihe/81106975381.pdf
    • http://saxobupazes.sportsontheweb.net/rafivijafirim.pdf
    • https://cdn-cms.f-static.net/uploads/4415302/normal_6012538f69748.pdf
    • https://cdn.sqhk.co/nakolore/jjjekbb/boritilapojep.pdf
    • https://cdn.sqhk.co/tuwetebep/w0hhk8N/x-_wing_flight_group_alpha.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/buwosevax/shimla_images_free.pdf
    • https://s3.amazonaws.com/xoxaneral/86004046253.pdf
    • https://s3.amazonaws.com/setaxilitozuko/approach_to_bleeding_disorders_in_child.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_off0000f5cb.bin
13111e639911c8631f3b3fc4ddeaf551b982e0d6dce1400b47a8c54f52859dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 5860 bytes
font_01_sfnt_off000109a2.bin
3d4da9b5c649887160563a8af0415b6b33dc0988d0819ff9b62d9e8e658c398a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 10260 bytes

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