Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c1454e0f11c0d9…

MALICIOUS

PDF

71.7 KB Created: 2021-06-01 02:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 526cc9cfa73a901621a609c4a07b6cc9 SHA-1: bd28ec3c667a2ecd86a8136c67daa2a0ea53430b SHA-256: 90c1454e0f11c0d99a0ba089d09714c0eb22781d730b195b47cacbd910d137cd
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://infrive.ru/pbw?utm_term=convert+18+kn%252Fm3+to+pcf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413113/normal_60371efbc7549.pdfIn PDF document text
    • https://koxepaje.weebly.com/uploads/1/3/5/3/135350813/tewip-pifarami-nadaxadijum-dajet.pdfIn PDF document text
    • https://dazutexigamufo.weebly.com/uploads/1/3/2/7/132740900/jogaw_womumunixumal_xufuzobewokeje_natonegup.pdfIn PDF document text
    • https://metogixum.weebly.com/uploads/1/3/0/7/130775033/kepijaximevog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5ff32a61b4271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_6054df4567e14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_6029864f52d99.pdfIn PDF document text
    • https://vugadeji.weebly.com/uploads/1/3/1/4/131406436/6938548.pdfIn PDF document text
    • https://geworusidexaj.weebly.com/uploads/1/3/5/3/135306562/aab1a62fe08dd6.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/bagubujidumuku_vadolegezexa_xapuvenoli_vadesozowe.pdfIn PDF document text
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/fa753d0275795.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viluxese.pbworks.com/f/34808297370.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/umuc_ifsm_201_excel_project_1_rental_cars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fece43a4-9e7d-49e0-acd4-dd8552e45fc2/likevurizunaf.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144416697/how_to_remove_instagram_stickers_from_someone_elses_picture.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/bewafa_hai_tu_dj_song_download_mp3tau.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144428574/47171397835.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144423237/r_programming_for_data_science_by_roger_peng.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/f/41261868018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30507e9e-9d97-4779-a822-e1a671537aec/what_happens_to_atoms_in_an_ionic_bond.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144413808/usa_today_up_and_down_words.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/hardest_friends_quiz_questions_and_answers.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/17871825229.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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 5216 bytes
SHA-256: deac07783169ca1fe02c537cff86b9b0bffd7f230a1091d6c3405634f81c5fbb
font_01_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 11100 bytes
SHA-256: 87a69b79021f6d47de1f3ccfeffdaf05678b28cd317f5123ea1b3b06e21624b6