Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6b34513a4d2551…

MALICIOUS

PDF

72.2 KB Created: 2021-03-06 04:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 219a7499c99ceb8c5d8acd28f65e1dfa SHA-1: bd787e2b750991eab4f0e07f9550e0e56c374a04 SHA-256: 5c6b34513a4d25519ba9baa14a38767e013612b242b1faa513cea86f0efa433c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to job searching, indicating a lure to attract victims to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/123?utm_term=acca+jobs+in+australia PDF link annotation
    • https://cdn.sqhk.co/rarukaboz/KOia3hf/rawedusimejonipetetididov.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/f9Jiax6/popeye_cartoon_song.pdfIn PDF document text
    • http://baby-slings.ru/what_is_faith_and_bible_versesauuyr.pdfIn PDF document text
    • http://cyberlife.store/gb_whatsapp_transparent_prime_latest_versionozabl.pdfIn PDF document text
    • http://wordsidepost.top/dedication_and_acknowledgement_for_thesis5cyqx.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/ji8FOgi/dog_licking_screen_gif_website.pdfIn PDF document text
    • https://cdn.sqhk.co/felegabiw/iemLkgr/wenogex.pdfIn PDF document text
    • http://gratoramaa.space/wulonusimurivilajebapa2fyxa.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/dhgufgd/reromupolo.pdfIn PDF document text
    • http://dress-russia.ru/pokemon_sword_and_shield_dlc_leaks_twitterjrwof.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/cchhhhi/baby_alive_grows_up_happy_doll.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/H5Ylje2/naduluwozaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vidoperife/sFhigjf/11140796691.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/ihAsjfn/40845275719.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/ghRwvjb/nulilelasawapubukigal.pdfIn PDF document text
    • https://cdn.sqhk.co/denobafopum/aU4lngd/88932717149.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/b104862a-28fc-4bd7-bff2-ef55602dc173/mapigafugij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f5853c-2cdb-4854-98db-8c92b7919390/guwiwujigibeb.pdfIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_c4cd094f36bc40ff890c392c208c41aa.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_49de23a42d2d4d51bfa37168644c56d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f41f982-07c3-48f1-8c56-ed9bb755b572/67654664486.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_a4d979462d3e4feb97bb130d5facb937.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_f2efbc457e944959a47c188f73bd9d05.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F4 3080 bytes
SHA-256: 3b6c3edccbbdf68622c80e44ac099bd4bffa00507f4f1bc839f0bdbf087aa810
font_01_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 4996 bytes
SHA-256: d8e7698bd56928caaadca3aeaf9cea119c3b4b697c39e399dd3bf0ffd158ba6b
font_02_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 10852 bytes
SHA-256: 9aac4cb292e8c11e4a6c849d3f04e552018481e0f3d656ebf4f317946bed9c99