Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f96ee0c41dde89…

MALICIOUS

PDF

83.3 KB Created: 2021-04-21 11:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3eb0d553347ff175f6aee8fab971c618 SHA-1: 762cc61c427053489861eeae0fa089f8bf1d742e SHA-256: e3f96ee0c41dde89e668e76c80fce136228dccae35812f9704e6a9bb3a3b9cfb
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to product reviews, suggesting a lure to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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=char+broil+signature+4+burner+gas+grill+reviews In PDF document text
    • https://cdn.sqhk.co/xodakebebit/hbsjaje/crafty_crab_prices_towson.pdfIn PDF document text
    • https://cdn.sqhk.co/nazamesuwute/fUhegjc/digestive_tract_anatomy.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/mujesogi/nitavuli.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_bd2b5e377fa9442b8b7357c313831fab.pdf?index=trueIn PDF document text
    • http://pubitawiwinas.rf.gd/58454131505.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_51fb8285cd12484f8bf8b5d48e00fd6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b94455e-da74-4a4c-86b7-0feea77cd52c/integral_cos_x_exp_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6322531-5ca4-4507-bfc7-4e77b2d94b67/wonim.pdfIn PDF document text
    • http://potaxupixikubud.rf.gd/septic_shock_in_neonates_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/brasserie_star_antsirabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6496e6-6a6e-44cc-8d28-62a432965411/how_to_calculate_pythagoras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431decdf-79f7-4bf3-9e8b-bf6e59325d3f/68939509263.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/who_makes_snapper_zero_turn_mowers.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/wow_darkshore_quest_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b8c0c4-e2c2-493c-b6e7-2216eebc2894/88502595673.pdfIn PDF document text
    • http://gogidovegesoxe.epizy.com/birthday_cake_images_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ef39fb-6b59-4fd7-8342-532c5e64ecb4/how_to_program_genie_mini_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf640bb-c97a-4215-8fe7-63ff8c38a252/gizeruxenenusuwezuni.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/is_russia_a_constitutional_republic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566ca8ed-1999-444f-b7ef-af89b46706b2/woloxovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828417d8-13c8-4088-ba6f-4568e3190dde/fetirejeret.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_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 5232 bytes
SHA-256: a5bfc76758834ed072aef9dfbf88a116f630badc5c120cd2efaa4c3a94ba2508
font_01_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 10548 bytes
SHA-256: fd5697a89458dd7977c95e718cbef6302c8bee6a4fb10ce26ee1831d9b7665e0
font_02_sfnt_off000131ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361