Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6f6e52bc6455be…

MALICIOUS

PDF

84.1 KB Created: 2021-03-06 00:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6012be531b54e48f4b5a48973f6fa618 SHA-1: 2abd18ef94cc7b146f0a760496f87349bef8ae23 SHA-256: 7c6f6e52bc6455bef61a48c0ba8fca322d750bc8cb46c7f6a23a7fd9bbf7692d
244 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, indicating it functions as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=black+and+decker+cm2035b+12-cup+thermal+coffeemaker+review In PDF document text
    • https://tupinikuwexopej.weebly.com/uploads/1/3/1/0/131070806/batikutegof.pdfIn PDF document text
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/xonadejukuxozu-gujovo-zogenemoju-bulof.pdfIn PDF document text
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/weduk.pdfIn PDF document text
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/ebdb4d8.pdfIn PDF document text
    • https://cdn.sqhk.co/fefavezevir/XijaAih/black_friday_2020_deals_walmart_tvs.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/fhjhhQq/fbi_special_agent_training_requirements.pdfIn PDF document text
    • https://ruvararet.weebly.com/uploads/1/3/1/3/131398095/nakebekewukol.pdfIn PDF document text
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/nododusep.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/gcY7nGY/basketball_tournament_application_form.pdfIn PDF document text
    • https://felavonirevokod.weebly.com/uploads/1/3/4/6/134606430/pobapozalabazejof.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/b68a57c646d0.pdfIn PDF document text
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/3579000.pdfIn PDF document text
    • https://menanolunum.weebly.com/uploads/1/3/4/7/134754058/7317873.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/679268.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/Fxhchdd/the_culture_map_discussion_questions.pdfIn PDF document text
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/2254245.pdfIn PDF document text
    • https://jegagevo.weebly.com/uploads/1/3/4/1/134109204/dd6b345cda08067.pdfIn PDF document text
    • https://xodozevonewoze.weebly.com/uploads/1/3/1/3/131384462/tojepasepuxisuwe.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://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_d39f59de8fc548a78bc73dc84e68d4d4.pdf?index=trueIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_026be6f1dda740289a0fa14815e62f12.pdf?index=trueIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_023a162941e4423191cad28678631b98.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_dc9074d4cd234e118531d5bf02ded08a.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_f71e1eaf2401422baf6da3ad0f91212f.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_1baa953551924cc2a21cf767c0be7fe5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 6152 bytes
SHA-256: 9fe5bc053f7d01e2007eb9f6c669075cbd70f1fda80975ee7219c296c8f42ffb
font_01_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 11108 bytes
SHA-256: 2c1d7872e2dce01c1bd094561ad237ed4cbfde8eb9594a874aab30d70d44af7a
font_02_sfnt_off0001345f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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