Malicious PDF — malware analysis report

Static analysis result for SHA-256 38aaf5a645f8216e…

MALICIOUS

PDF

73.9 KB Created: 2021-02-16 14:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2371650493ac0368408fd0beae53535c SHA-1: 079d0b55c9d2323bde17340bf126616be6413dd5 SHA-256: 38aaf5a645f8216ed2bbe6557d3a738ad12e2f9b1fadd8b4646cf64590393d9b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing or trojan variant. The embedded URLs likely serve to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/wb?keyword=vegetarian%20split%20pea%20soup%20recipe%20instant%20pot PDF link annotation
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/aed2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_602b06a051b6f.pdfIn PDF document text
    • https://lofusomibebez.weebly.com/uploads/1/3/2/7/132740423/a7ab8ddcfcb0d.pdfIn PDF document text
    • https://varusotefus.weebly.com/uploads/1/3/1/3/131398431/todilotep_juxutisigigutup_jevorepejamukoz_vopuvofita.pdfIn PDF document text
    • http://lowazutax.22web.org/79860276537.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/fiagjj5/bake_it_easy_porsgrund.pdfIn PDF document text
    • https://zavurebugefogoj.weebly.com/uploads/1/3/4/3/134397626/vexanifesedabiritula.pdfIn PDF document text
    • https://ruwuragawani.weebly.com/uploads/1/3/4/3/134383911/82a662b9.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/5169362.pdfIn PDF document text
    • https://tujuwofaxeg.weebly.com/uploads/1/3/2/8/132814826/narujamugasaxaz.pdfIn PDF document text
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/9322121.pdfIn PDF document text
    • https://xafijaxipumin.weebly.com/uploads/1/3/5/9/135966545/nimerejodozumavew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_6015b8ded8955.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/jaidid8/craigslist_denver_cars_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wulagisi/ativa_shredder_8_sheet.pdfIn PDF document text
    • http://mubufelijora.epizy.com/fexotefirapaxes.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/unity_assets_bundle_extractor_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/95650891884.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/mathematics_questions_and_answers_for_ss2.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_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 5064 bytes
SHA-256: cd8058bfc4a0fd35e7a3ea8c246b2a287a0a369e2b94f521d8cbdf4a74872d27
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 11180 bytes
SHA-256: fe0d214f4a1f14c689b83ce03a0d41c9ace0b1b98f88eb13fd47e355e6050edd