Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3aaf1c7c0d7d5b…

MALICIOUS

PDF

70.8 KB Created: 2021-04-24 23:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b8a11f626c8998f81e086bb0c561b506 SHA-1: b99a33f29a8b2bb3337f7696969f84b62f9928f8 SHA-256: 6d3aaf1c7c0d7d5b4244bcd67078c14681f24ab4da4ed09f8b708bd8462a04b0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a crafted lure. The presence of external URIs and link farm heuristics further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://fokemale.ru/strik?utm_term=the+practice+of+statistics+5th+edition+pdf+chapter+5 PDF link annotation
    • http://rewita.fun/nekoxafurafibijuz9o7j.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/36919659316ini7z.pdfIn PDF document text
    • http://detonic-de.website/1942702711cmniy.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/VfNjjeg/88350067701.pdfIn PDF document text
    • https://didirivex.weebly.com/uploads/1/3/4/2/134265945/duzev_gomexekirot_tilabunipeduni_juxozi.pdfIn PDF document text
    • http://beremoter.online/cv_uk_template_freeq86co.pdfIn PDF document text
    • https://bukowimulo.weebly.com/uploads/1/3/1/4/131407836/82c34d3.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/wulipani_sulunigi_figeka_fimifiwev.pdfIn PDF document text
    • https://zafimalomaw.weebly.com/uploads/1/3/4/4/134458932/382456.pdfIn PDF document text
    • https://semizafug.weebly.com/uploads/1/3/1/8/131871859/9658991.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/jfjaXjj/market_garden_tools_europe.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/5177f3df-8b98-40a2-8a38-81ce5f0aedb3/4_pics_1_word_level_2680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09694517-5c89-4eec-9a73-0ff2b41794bd/kewozugegujuwokanemigov.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/45640931298.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/music_rhyming_dictionary_book.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/58440834808.pdfIn PDF document text
    • http://lutukoxu.rf.gd/free_printable_employment_verification_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c256f20-e6c2-43f2-81fb-03a8f1fca7f9/webogefatabagozozidijiset.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/bojupokalazurisupu.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_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 5284 bytes
SHA-256: 2a4e3e2746254bd03ddb546ee81ad20d063e6a8f07f638c41f8de553d2149a14
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10808 bytes
SHA-256: ff85b05a392be5337c4841bbed77e78b753e2b9b0719ca99e66dc35825501ea8

Open this report in the interactive analyzer, or submit your own file for analysis.