Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05df51f09862a66…

MALICIOUS

PDF

78.7 KB Created: 2021-03-13 14:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f6d40af030c1cfdad537dd819601a9d3 SHA-1: 9634a2b044b7fba66ce267d23925ef7f7a7dc5dd SHA-256: c05df51f09862a66319375e7a89a622c5e4dafeed4526fff5e4f7fc1156953b0
186 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 point to disposable domains and are likely part of a link farm. The embedded URL `https://jacksth.ru/wix?keyword=assured+at+home+drug+test+dollar+tree` suggests a lure to a website related to the search query. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing purposes.

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://jacksth.ru/wix?keyword=assured+at+home+drug+test+dollar+tree PDF link annotation
    • https://cdn.sqhk.co/liminekaj/vPChf8M/91528982650.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/Vh2oijE/control_tower_word_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/rheghhh/run_3_unblocked_games_77.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/idLhjtL/7485523443.pdfIn PDF document text
    • http://kotowis.22web.org/national_antibiotic_guidelines_2018.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/9882504.pdfIn PDF document text
    • https://cdn.sqhk.co/lopokevofoti/owgcgdq/100_doors_world_of_history_2_level_49.pdfIn PDF document text
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/nixidanedari.pdfIn PDF document text
    • https://masogivuxun.weebly.com/uploads/1/3/4/8/134887982/16d8c87.pdfIn PDF document text
    • http://gesenimul.22web.org/89342432683.pdfIn PDF document text
    • https://cdn.sqhk.co/neguvobipa/6ukuhgq/suvosevojuj.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/fajonubinomeder/bluetooth_hacker_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/99943847875.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/anniversary_song_for_mom_and_dad.pdfIn PDF document text
    • http://tefinavi.epizy.com/affairscloud_paid.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/electromagnet_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/64303344202.pdfIn PDF document text
    • http://novezepif.rf.gd/sovom.pdfIn PDF document text
    • http://nonepajurela.rf.gd/bksb_english_test_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 5228 bytes
SHA-256: 5a4902a099d9492d1a3130a3255eee55141ef389222e8b1565347f268eb3f8d4
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 12240 bytes
SHA-256: 0c9c5c2ef78ac52beeb345da82cd9ebb35aacc955a89ba109877e38e6e5deb01

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