Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe790ca7d77bd54e…

MALICIOUS

PDF

81.2 KB Created: 2021-03-31 16:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0246dd7cd805fb1d1d4a0235fc328a75 SHA-1: cff8f3b7fad4a77858d2cb4bacfb6d176e0872bd SHA-256: fe790ca7d77bd54e0e46e03084bfa5bf003922115ee37dcf5484c90cd7c34804
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate this behavior. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/123?utm_term=chrome++file+for+windows PDF link annotation
    • https://cdn.sqhk.co/kizusuvut/TuZtjaI/youtube_rocketman_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_601f268697739.pdfIn PDF document text
    • https://wegeduvoxu.weebly.com/uploads/1/3/4/6/134634177/badon_lufaguvan.pdfIn PDF document text
    • https://fologonalufofu.weebly.com/uploads/1/3/4/6/134694067/dubuka-polaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384036/normal_6004525c09c08.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/gdhiKas/mokiwaxuroludamuxokan.pdfIn PDF document text
    • https://wegotogad.weebly.com/uploads/1/3/4/3/134342574/paxidometesex.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolegu/i0he5jc/lusepegajafexafogutodaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_6051beedeeab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_6054d63e47993.pdfIn PDF document text
    • https://bisuduroj.weebly.com/uploads/1/3/4/7/134714880/4772684.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/xicu5ia/31315736108.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/iXifr8S/82519504881.pdfIn PDF document text
    • https://cdn.sqhk.co/xugikokazo/EhjjijF/onedrive_download_folder_android.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/gisJDjj/wafopugijixatudujezanan.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenemu/ijU3ibV/ions_and_isotopes_worksheet.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/dutemepolobi.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/ibhjjiV/47096302693.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
    • https://uploads.strikinglycdn.com/files/5953924f-efdb-4633-a726-095044cf0c72/frigidaire_dehumidifier_50_pint_with_pump.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/pifimeketilol.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/simple_present_vs_present_continuous_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cea47ab-461f-4929-8f4e-0165ac8d448c/13604805227.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/text_to_image_generator_gan.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/is_oster_a_good_brand_for_blenders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be51be58-39b4-44a2-9e0b-f6af0c696419/blank_soccer_practice_plan_template_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/010bd50a-55e2-4bf2-be15-bfe8748b34bb/sony_rx100_iv_price_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/toro_timecutter_ss4235_bagger.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_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 4760 bytes
SHA-256: 94a18487f1900539f60125dd8afe37afe24d7d99e25c90b182d54fb78f7e24db
font_01_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 10328 bytes
SHA-256: b68f9cb4a3bc8a41b3e773dc3064d8900d0e957f982aed3dd6ba33f3b6c0a3ef
font_02_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361