Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ebc62401b34a32…

MALICIOUS

PDF

73.7 KB Created: 2021-03-27 11:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4557cd1bb1d8ac86d9becd92d7099967 SHA-1: b06b858c5c9e9b6870132b8eb8f3830286c6e456 SHA-256: 71ebc62401b34a32a31990b93506fe47b2f5649bdddbff3aceb9e3facff440e1
202 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' and 'SE_DOWNLOAD_BUTTON' heuristics indicate a social engineering attempt to trick the user into clicking these links. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gimoguvi.ru/123?utm_term=commissar+yarrick+datasheet PDF link annotation
    • https://cdn.sqhk.co/pinofizulag/hbjcuja/52252143860.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/90gcWje/baby_boy_skin_for_virtual_baby_shower.pdfIn PDF document text
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/1877929.pdfIn PDF document text
    • https://pefisidedufe.weebly.com/uploads/1/3/4/9/134902532/f3652a69a0b.pdfIn PDF document text
    • http://takafebuxoz.22web.org/20383975232.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/jSwidaA/snake_game_online_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/iQ9jfJ6/kaxemotupinaruvafokamu.pdfIn PDF document text
    • https://cdn.sqhk.co/dilipokoje/gfjhNia/gangs_of_new_york_espanol.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/jbHjchb/picture_perfect_crossword_puzzle_83.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/iggthfI/vagidojiponasuxuvawo.pdfIn PDF document text
    • https://cdn.sqhk.co/wenisuvuroju/Hdie7vU/dwts_2020_partners_spoilers.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/jfYFklA/ganonetatoxedimawabajizex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piguzivi.epizy.com/71723089174.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/the_stand_2020_review_rotten_tomatoes.pdfIn PDF document text
    • http://putiweg.epizy.com/tepajuxuxemaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/howrah_bridge_movie_free.pdfIn PDF document text
    • http://deweperiji.epizy.com/canterbury_tales_analysis.pdfIn PDF document text
    • http://nadiripu.epizy.com/mugefaradux.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/varegimanalogul.pdfIn PDF document text
    • http://sozogakuvigoxev.epizy.com/marriage_certificate_online_mcgm.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/proust_a_la_recherche_du_temps_perdu_english.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/19899950882.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_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 5220 bytes
SHA-256: fc02067824aad694ee1e9495a809e4abd65262f26081c4275cf3eb371e15aa36
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 10272 bytes
SHA-256: 080ff91524e7c4795e08031c30c13d3eb483ec77caba2f7c3e6f363f73800e9f