Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5eda19bfca378b2…

MALICIOUS

PDF

83.5 KB Created: 2021-06-06 18:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1897e04096bdc0a88c7cd5b0a0a431c9 SHA-1: 5020a723c400bb5724e671b6ff78b008e52e6189 SHA-256: b5eda19bfca378b24d39dca68def41797b2e125785c0cacb873c32850fdac384
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or to redirect users to malicious content. The primary URL observed is related to a search query, further supporting the SEO manipulation angle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/pbw?utm_term=what+is+the+difference+between+milwaukee+m12+batteries PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452851/normal_60552e716191f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5ff4106f27a00.pdfIn PDF document text
    • https://zibabesisem.weebly.com/uploads/1/3/4/6/134670176/cf890c1dfa46e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_605684fce1e68.pdfIn PDF document text
    • https://jurogewogil.weebly.com/uploads/1/3/4/3/134318518/56947cd.pdfIn PDF document text
    • https://tukukanabov.weebly.com/uploads/1/3/4/4/134444705/e28ae348bf9.pdfIn PDF document text
    • https://musazulawikale.weebly.com/uploads/1/3/5/3/135305526/dudilixiwivetox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5fea43c685704.pdfIn PDF document text
    • https://pirulavedup.weebly.com/uploads/1/3/1/3/131379447/3009511.pdfIn PDF document text
    • https://gupibaparokepes.weebly.com/uploads/1/3/4/8/134889539/1021616.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494140/normal_5fdfa25aa1069.pdfIn PDF document text
    • https://rupokolox.weebly.com/uploads/1/3/0/8/130813141/7252012.pdfIn PDF document text
    • https://zogabugopevaluz.weebly.com/uploads/1/3/0/8/130814784/xafiwegoti.pdfIn PDF document text
    • https://loboweron.weebly.com/uploads/1/3/2/6/132681880/2701709.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvuxagola.pbworks.com/w/file/fetch/144601848/ribexojuposoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471eedc5-6e2b-497b-b36d-55535b1905da/45316727141.pdfIn PDF document text
    • http://bojifimaral.pbworks.com/w/file/fetch/144628503/43427036191.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/the_hunger_games_mockingjay_part_1_free_online_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0bb0e2a-576e-4906-b41b-1f8ba8bf08bb/being_at_peace_with_yourself_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5b5ed5-cc76-46f7-8133-9dc204d87ea5/what_episode_of_the_vampire_diaries_do_elena_and_damon_kiss_for_the_first_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1077e184-7e67-4ca4-8a01-9052d54513c5/sgx_nifty_live_candlestick_chart.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144436491/the_metabolic_approach_to_cancer_summary.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144448737/stick_rpg_unblocked_games_google_sites.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413256/wuditofujusumowibajezaza.pdfIn PDF document text
    • http://pifiloxema.pbworks.com/w/file/fetch/144689490/11818801174.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_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 5756 bytes
SHA-256: 0f7b5a7f63be0622784c2dfc9237c143234184d86cec90f846e63a00fa8def88
font_01_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 11452 bytes
SHA-256: 3afe258a9ededc34af0d85b9d40415ebb0e8d74bd28a79f79f7b3a09a09d4160