Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6707e9c959fd43…

MALICIOUS

PDF

79.8 KB Created: 2021-03-07 15:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a6730c5103f88b3b9b9ee6cefcb766d4 SHA-1: b25c3a5377d8b92967eb9697678e984f9d4aaa53 SHA-256: fe6707e9c959fd43299ed833ee5946f9bf22fa9d0fe1419dfec3d70e1d0379d4
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on potentially disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=2017+subaru+forester+2.5+i+premium+standard+features In PDF document text
    • http://soldonlakewood.com/orthographic_projection_solved_examplesl6lyu.pdfIn PDF document text
    • http://itasummer.fun/vadenitobo86j9.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/hhhgeRO/bloody_roads_california_cheats_apk.pdfIn PDF document text
    • http://goossyy.online/70479609740xk43t.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/what_is_the_concept_of_sustainable_human_development.pdfIn PDF document text
    • http://biolinkus.me/vumuvexowojumosudarezaowdx7.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/38547558377.pdfIn PDF document text
    • https://sojisesoto.weebly.com/uploads/1/3/1/4/131437607/zonabarat-boxukadov-zekip.pdfIn PDF document text
    • https://tekigeja.weebly.com/uploads/1/3/1/3/131384442/ripasukesejote.pdfIn PDF document text
    • https://dijujuvosidig.weebly.com/uploads/1/3/0/8/130873718/3259c9c.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/focusrite_18i8_power_supply.pdfIn PDF document text
    • http://soul-felt.com/16006924501igep9.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/jyhbl11/baking_recipes_with_biscuits.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/iCX2zgi/migakivud.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/91180318-dc94-419e-a330-424463256459/jhu_deans_list_spring_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5524c59-cfce-4dac-ade0-b1c44391e94c/pedagunexosogafojenagazus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a0109d-fb7a-404e-ac0d-1fabea01b07f/hp_officejet_7310_all-in-one_print_cartridge_alignment_failed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26a6415-a7e7-4b75-9639-0f934f893b56/50729624517.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_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 5760 bytes
SHA-256: a611573afd65b238efbdded90cd41efdcc7d54a34ad192258d6a318ab03903c2
font_01_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 10656 bytes
SHA-256: c71a963f7fde4592d797d0e194aad108895ec8b8bca625bfcf603ee4b5b2c7be

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