Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd7c2cffd49c114…

MALICIOUS

PDF

80.2 KB Created: 2021-04-18 10:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 107f439167c8598cc6c8b13938956f50 SHA-1: 8749288434ddfa13b3579726c2ef1985b2856017 SHA-256: efd7c2cffd49c114f0ed1e6ebf9f558e2d6e1338d88926127453f00e3060307c
184 Risk Score

Malware Insights

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

This PDF document contains embedded links that redirect to known malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document's content, though obfuscated, appears to be a lure related to academic writing, likely intended to trick users into visiting a malicious site. The ML classifier strongly supports the malicious verdict, and the presence of multiple disposable hosting links further indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://yafferge.ru/strik?utm_term=how+to+write+a+research+paper+using+mla+format In PDF document text
    • https://pakuxijinede.weebly.com/uploads/1/3/4/5/134527704/feduk.pdfIn PDF document text
    • http://onlineeshop24.xyz/organic_chemistry_portal6ncmr.pdfIn PDF document text
    • https://birifisak.weebly.com/uploads/1/3/4/4/134493055/1294098.pdfIn PDF document text
    • https://tofamofale.weebly.com/uploads/1/3/1/4/131406114/rebaji_givegowagubuxa.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/160537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_6047a33c9f9b5.pdfIn PDF document text
    • http://bigtittybella.com/chp_accident_report_phone_numbers0w2l.pdfIn PDF document text
    • http://teachersaid.fun/que_tiene_que_tener_un_botiquin_de_primeros_auxilios_en_una_empresan8igg.pdfIn PDF document text
    • http://pro-komp-master.website/plate_tectonics_crossword_puzzle_answers_brainly298ll.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485939/normal_5fec168bafc0a.pdfIn PDF document text
    • http://matras-24.ru/26201847240n4wwj.pdfIn PDF document text
    • http://invitesistem.ru/73041773880h1cjw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_604b79e5a2bb1.pdfIn PDF document text
    • http://copyrightshelpscenters.com/how_to_teach_elderlyb4k03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_099e58e613cc4cbdbcd01f3ae397e833.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/329b962b-d88f-4d3f-8922-858d1946bd17/what_are_the_most_popular_idioms.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_37762e5c5736453cbffcc9fb441db027.pdf?index=trueIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_0a2f605d1d234ec08b0fd748f8e3ed89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ab2085-eb96-4d9d-a240-80a37e9518c3/vuvurugalafil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c661cd-8ed2-42e0-97db-4becedf7f101/20102582954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e901e3f-4bfa-4f5e-96c8-9daa38e82be6/vovewamedazed.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_fd83930526854e70b2d0011db4784d15.pdf?index=trueIn 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_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 5480 bytes
SHA-256: 6ab8b509285d0d1a51cfd3c6ff30453eae07c40f58165bc0c2c5d99800e6fade
font_01_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 10696 bytes
SHA-256: 865ca07ed869ccef1bee7a9d08f9ca83bb4843fe6ce6d53ac3b27aeac7483eb2