Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c51504f3febfa1d…

MALICIOUS

PDF

99.9 KB Created: 2021-03-04 21:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: c70182890b071c01fb94148adf5e3247 SHA-1: 3dcdb360528e8bee16ba7845e24fd6aafb894dd4 SHA-256: 1c51504f3febfa1d2b94771c0e8982f084b5a3e54b205f57d3e7a7cce484004c
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware via these links. No scripts were extracted, but the document's structure and embedded URLs point to a link-farming or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://botokaw.ru/strik?utm_term=can+i+do+dbt+on+my+own PDF link annotation
    • http://miworusak.iblogger.org/86974769335.pdfIn PDF document text
    • http://gujejimoge.iblogger.org/excellence_el_carmen_death.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/cgc6hia/local_music_player_no_ads_apkpure.pdfIn PDF document text
    • https://tiguxenejizowi.weebly.com/uploads/1/3/4/8/134899735/8067153.pdfIn PDF document text
    • https://kojezuduw.weebly.com/uploads/1/3/5/3/135326104/5d7941df.pdfIn PDF document text
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/padenoxisutojagufag.pdfIn PDF document text
    • https://cdn.sqhk.co/lutugivaje/hdsib3C/90_s_album_songs_mp3_download.pdfIn PDF document text
    • http://vugijow.iblogger.org/31343855767.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/I1jacid/77319927208.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/thdZowq/jomibupinekesixod.pdfIn PDF document text
    • https://nuwevalixur.weebly.com/uploads/1/3/5/9/135990129/e819f121128.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/hdghhg9/30193593653.pdfIn PDF document text
    • https://rukusipaxup.weebly.com/uploads/1/3/2/6/132683367/sukosimet.pdfIn PDF document text
    • https://cdn.sqhk.co/tawunipufop/6e1ifey/ludijojewor.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/y9jhhad/clash_of_clans_golem_attack_strategy_th8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wawavubuwile.rf.gd/stansted_airport_aerodrome_manual.pdfIn PDF document text
    • http://tapegazopiguw.rf.gd/47201982219.pdfIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_5f1831172f964ae8b80e99b6f8935652.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_95b21f37489b4be087b6666bf1f0cb61.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_8e1639deff8c45ca94b6e79806485196.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_ace3d5d081484a43889cc2da735b1067.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_be8476763042462f94e3fce1bb7cf2a9.pdf?index=trueIn PDF document text
    • http://lojetewope.epizy.com/84062589044.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0C 4692 bytes
SHA-256: f7f379c22eb78d283c38b11c9d06b8b589eaede8a3e5258cbcd49a4d1f21a23a
font_01_sfnt_off00014dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFB 10980 bytes
SHA-256: 2e00106abed47ce5dda39945ac2d6aede12a9ede2ad945caa8aeb4e58c7eb01d
font_02_sfnt_off00017397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17397 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176