Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86badc58a81c66d…

MALICIOUS

PDF

77.7 KB Created: 2021-04-19 12:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 368d4a6c80dcaf6613fafbadd3275e4b SHA-1: 2058f8a5a344eb78f5dccdaaa3a8f5c2bcab2d21 SHA-256: a86badc58a81c66dc6c03b7f10fef55f333c94615bd721ccc3214bc387c2385b
166 Risk Score

Malware Insights

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

The PDF document contains multiple high-severity heuristics indicating suspicious and invisible links to external domains, including 'com-login8.xyz' and 'ponafet.ru'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were extracted, the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://ponafet.ru/strik?utm_term=do+nucleic+acids+contain+nitrogen+and+phosphorus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370304/normal_60565ef694664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_6019facd6a64a.pdfIn PDF document text
    • http://hytri.com/gukevarijogukqkwm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_606097d186094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_6026217af0e92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_60249ab23e535.pdfIn PDF document text
    • http://genoray.pro/how_to_summarize_a_casenypfo.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/5y2wbn2/griselda_merch_ebay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_605c36e8abb6c.pdfIn PDF document text
    • http://idealica-italiauficiale.website/37112041311pwt7u.pdfIn PDF document text
    • http://com-login8.xyz/11th_tamil_sura_guideegj0o.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/hiii8ic/real_estate_answering_service_toronto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_6018022716714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427780/normal_5fdd43f142023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368763/normal_5ff68d0b5a8ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_60684f5ea4e92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_606a3657b156e.pdfIn PDF document text
    • http://mir23.xyz/mata_ke_bhajan_video_song3voc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_6008b28c95086.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/854ad75d-9d8f-4acf-8160-0a00aafdd948/whats_the_most_read_book_on_wattpad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a10c60-939e-4e83-9ffc-9efc1ff13af3/10550653116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc40ce28-50a3-4bdc-bc7f-715759e6d5a6/tinojusoludejilagibik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b666c8ae-79af-4640-af9d-ceca6e3fe541/49310653563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aaf44bb-4d0a-477b-b65e-bf7f1c5ae955/guvipatugazezusut.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_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 5332 bytes
SHA-256: 9afcdf49e05e3ad335e068b6834cb2a0d3a4a6522d9c91d49b21b55797dfc6b6
font_01_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 11620 bytes
SHA-256: 118599d2a76160daa94d4c54eb847c346ad29458dcdc897eb236f0513708d372