Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44ed30734bec5d1…

MALICIOUS

PDF

80.3 KB Created: 2021-03-02 03:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b20f7be905fe954d10f5c184eb89258a SHA-1: 686db1d9bd84ef6042765b5a4be2f3cee9e2fdd0 SHA-256: a44ed30734bec5d1fa9a3040bf21e90480f3e8348b19589de683235cb1f188fd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm for SEO manipulation or to distribute further malware. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to external resources, potentially leading to exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=tableau+online+training+and+certification PDF link annotation
    • http://my-favshop.online/8051988564405lm8.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/wizards_first_rule_hardback.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/ijdliid/63505008429.pdfIn PDF document text
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/xizane.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/hc3Ahcb/kevaxoxepaz.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/does_hcn_have_hydrogen_bondingit3cd.pdfIn PDF document text
    • http://arthromedro.xyz/what_is_another_word_for_family_problemsiw89f.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/hdhaihh/25th_hocus_pocus_anniversary.pdfIn PDF document text
    • http://delayikapy.xyz/dragon_ball_z_dokkan_battle_jp_apk_modx33h7.pdfIn PDF document text
    • https://jizoneva.weebly.com/uploads/1/3/0/7/130738725/07ff5c874f6.pdfIn PDF document text
    • https://bixugukov.weebly.com/uploads/1/3/2/6/132680808/2141828.pdfIn PDF document text
    • https://cdn.sqhk.co/makafabakuna/Cpgjcjh/download_tiny_battleground_mod_apk_unlimited_money.pdfIn PDF document text
    • https://sojikopel.weebly.com/uploads/1/3/4/7/134760404/2704116.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/jgDifgj/30806521970.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/EidgiyB/39680553956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gosete/xumiresavilaxojexobo.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/ti_84_plus_silver_edition_games_pokemon.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/81447885405.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/bohemian_rhapsody_trombone_sheet_music.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_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 5100 bytes
SHA-256: e6060e2d316690adfeb8c22ea22002929060baa88f7e08d1c1a200d457b82f67
font_01_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 10492 bytes
SHA-256: 6b069d41e2105620b95bc7cbb6dc958169b0b069fa1cd077d93b2d5f8916225e

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