Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd97f3aa9c73633…

MALICIOUS

PDF

73.5 KB Created: 2021-02-23 08:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b33258ef9f15755ec8413fdfa71d36cc SHA-1: bec2bd7820ef41930d58abab5e5246b8773eb69c SHA-256: 1bd97f3aa9c73633b23bf93c0b57f8bc856cfabe4a51e81596e35dcc1d099377
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://maypoin.ru/wix?keyword=advanced+acupuncture+a+clinic+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/tisufupujeli/avhd5ji/dora_world_adventure_game_free_download_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5fe292e6c507d.pdfIn PDF document text
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/kofopaja_niroji.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/mizuwumolijuru_viridis.pdfIn PDF document text
    • https://motanufogok.weebly.com/uploads/1/3/1/3/131381166/411231.pdfIn PDF document text
    • http://manoligixave.66ghz.com/ff9_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/fIJjchj/lamborghini_car_simulator_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zudoputasafe/nBnzhaT/offroad_truck_climb_legends_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_5fe721306b6ee.pdfIn PDF document text
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/f2fe46078d9e52.pdfIn PDF document text
    • http://teniran.22web.org/chain_of_custody_form_digital_forensics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwarikufaz.epizy.com/alfheim_portals_bayonetta_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/mabekixovudezivumi.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/88139464141.pdfIn PDF document text
    • http://lavavil.rf.gd/90406099090.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/computer_beep_codes_and_their_meaning.pdfIn PDF document text
    • http://pufaperimixalet.epizy.com/xenupimure.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/xupidutugunudoxidojil.pdfIn PDF document text
    • http://riberudedanute.epizy.com/20436824901.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_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 5172 bytes
SHA-256: 17e161fcdcff5292b76e659b1cd45f929f786ebfdfd51110802fbfac120860b8
font_01_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 10180 bytes
SHA-256: fbffaff211415348a4825e466c301f57527b14614ea7395da05a46b739bfa26a

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