Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cd1588d0494d8f…

MALICIOUS

PDF

92.0 KB Created: 2021-03-18 00:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 83b69cc8cab0aaea705124b15f02e536 SHA-1: 1b5ed0df9f1de9f7642a920707e0b079a023ed63 SHA-256: 83cd1588d0494d8f22b477c5ddb457a587852bea2bcc18428f45e1f8a67fb96a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jumiwimov.ru/award?keyword=ccdmd+exercices+pdf+homophones PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368467/normal_5ff27e1eeeafe.pdfIn PDF document text
    • http://sberin.xyz/the_secret_byron_preiss_imageszk8hc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_601977e9f3441.pdfIn PDF document text
    • http://lojasamericanasbr.com/how_to_lubricate_kenmore_sewing_machinecbt85.pdfIn PDF document text
    • http://petrol-v-pol-price.site/o5xo1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_602317897c257.pdfIn PDF document text
    • https://cdn.sqhk.co/pakelabete/hj4CfsE/espn_live_sports_and_scores_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/jfzhegQ/free_slot_machine_games_for_fun_only.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_5fe8d5bd8eb6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_601d28f32c405.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/hhfjaij/83383844215.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/IhbeZ71/75492294831.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxaroposa/ggvIzge/blank_bowling_score_sheet_template.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/77a66580-7842-4c30-9639-94685764f62f/sta-rite_pool_pump_bearing_replacement.pdfIn PDF document text
    • http://retinibefefemo.rf.gd/443281001.pdfIn PDF document text
    • http://gawekavadave.epizy.com/9th_3rd_term_tamil_guide_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592942aa-1a8e-4210-bf89-bd57033971c6/john_norwood_fisher.pdfIn PDF document text
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_8334d61c3aa943f18c35d81a11751c4c.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_d3ad997b5d3a46fa9864e3309a2dcfc7.pdf?index=trueIn 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_off000116bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BD 5128 bytes
SHA-256: f8e902e6d988923dfb316681e94e1d87d64d02ddb56bd8a667c3b6d3bf339fc2
font_01_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 20116 bytes
SHA-256: 0ff6be10a1ee2c046604d45daa7ffc1f0a149cdb12bb29f1d657b2224071524b

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