Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5f815068b511d6…

MALICIOUS

PDF

98.8 KB Created: 2021-03-18 06:36:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5b2763c5c359b6413dd2e8960e607198 SHA-1: 6e79bab3676c8e6b2453fa3e5faa941cd2507433 SHA-256: 8f5f815068b511d6c8f13bb7148b2cf404c0afddecf45eedae07661ee6580624
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 pointing to disposable domains or redirectors, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/123?utm_term=cnbc+market+guide In PDF document text
    • http://volosaty100.xyz/97378013450otq6u.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/e669f3.pdfIn PDF document text
    • http://instapriz365.online/zudewubidajatetunikfm8c.pdfIn PDF document text
    • http://kexawez.mygamesonline.org/1853993244.pdfIn PDF document text
    • https://loxoxonejuk.weebly.com/uploads/1/3/4/6/134684666/bagiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_601f81171acb1.pdfIn PDF document text
    • http://vijofudevadotar.mywebcommunity.org/job_interview_questions_and_answers_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_6027bbc42eb75.pdfIn PDF document text
    • http://coolstudent.space/38309126786unbae.pdfIn PDF document text
    • http://testvvd.xyz/html_css_javascript_coursehyri3.pdfIn PDF document text
    • http://ighelpcenter.xyz/63987781257wu4rq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498366/normal_6001cc1e64f81.pdfIn PDF document text
    • http://hookup153.space/jodolepunonimkd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_604aa7337f753.pdfIn PDF document text
    • http://fb-ig-copyright.com/ayesha_siddiqa_military_inc30z4v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_5fe66947923b5.pdfIn PDF document text
    • https://lobusuzagoti.weebly.com/uploads/1/3/4/4/134470260/neferuk_bumukawikumuker_dogomorag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_5805f1c701ff4341b3c8dcd9d45a0d15.pdf?index=trueIn PDF document text
    • http://pekamidakoj.atwebpages.com/90435952987.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_6f1d4f86fae44f159257a3c0a10678f8.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_241f01575e2546df90c112acf3fa3521.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_acdce25edf54465fa1dd96bd6209d6cd.pdf?index=trueIn PDF document text
    • http://kipazafar.atwebpages.com/xezujejamusigobupuwobon.pdfIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_446dc9c69d6240a38bcf00bf81f6d285.pdf?index=trueIn PDF document text
    • http://durenifujogax.myartsonline.com/marvel_comics_subscription_gift.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_off000142fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FA 5156 bytes
SHA-256: e91aff7dac834e352267b9dad36acdb4d81e90e52c95dcead064ae2361267739
font_01_sfnt_off00015465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15465 12168 bytes
SHA-256: dc986ec6c3b5e14b43c93cff917620b883d7eda78cc9690f4161d4110412564c

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