Malicious PDF — malware analysis report

Static analysis result for SHA-256 995a594e4656a139…

MALICIOUS

PDF

73.5 KB Created: 2021-01-24 02:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b6e44636549e2161f20a217694a89657 SHA-1: 1ae23ca8d79b83c61988fcc4ec3d8ff0dd3eb803 SHA-256: 995a594e4656a1390919fbd7cd9f896c44738cfe8dfd4dedd909801ce2258f76
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of 'utm_term=ingles+sin+barrera+gratis' in one URL hints at a lure related to language learning, possibly to trick users into downloading malicious content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or downloader attack pattern.

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://bologen.ru/123?utm_term=ingles+sin+barrera+gratis PDF link annotation
    • https://cdn.sqhk.co/zururodi/xUhe9hh/pacman_frog_size.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/UkjvhbT/9952855372.pdfIn PDF document text
    • https://pegogelixuj.weebly.com/uploads/1/3/0/8/130813965/2341378.pdfIn PDF document text
    • https://cdn.sqhk.co/dovepomazeri/b6Jidih/transferwise_reviews_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425507/normal_5ffdd1449ba58.pdfIn PDF document text
    • https://vukekitap.weebly.com/uploads/1/3/1/4/131438073/dekakuxubof-jefuziwax-tilusoku-pokeberanokozax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464080/normal_5ffcb75edba9c.pdfIn PDF document text
    • https://site-1221887.mozfiles.com/files/1221887/caller_id_identification_free.pdfIn PDF document text
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/5880291.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/9851635.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5ff254d94a0fc.pdfIn PDF document text
    • https://site-1175951.mozfiles.com/files/1175951/national_antibiotic_guidelines_2017_philippines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5fdc882fef037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_5fd82c49e9bac.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/jutilovolisidab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kefixofelapadi.epizy.com/slow_motion_bharat_song_bestwap.pdfIn PDF document text
    • http://pejonoma.epizy.com/cisco_switch_300_series_datasheet.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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 4932 bytes
SHA-256: 0e2aaba7fb1dbd440c59999e41ec0baf214969bff560b3707c900f73e9558104
font_01_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 11916 bytes
SHA-256: 0951bb02bf07af4d0f1de07c651eb1deae206abedd3ae415a6b746e00128b954

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