Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b88d27853d2f82…

MALICIOUS

PDF

78.0 KB Created: 2021-03-16 18:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a45e1b008aa1600f8030a150421d9a1a SHA-1: 210f5c5203ebdb28ec0d997e7edab22efde20540 SHA-256: a2b88d27853d2f827bfc5e5f39915d6fde5d873fe7dcab6f3699e812d8c14583
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of an SEO spam or phishing campaign. The embedded links likely redirect to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/award?keyword=autumn+leaves+easy+piano+pdf+free PDF link annotation
    • https://cdn.sqhk.co/tekunipifob/NghUggr/learn_python_programming_masterclass_udemy_review.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/bizamo.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/gigcjjS/stalker_cat_live_wallpaper_full_apk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/ltxiaf7/best_flight_booking_apps_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/gZjaidK/sixozosufenufenatulelunon.pdfIn PDF document text
    • https://cdn.sqhk.co/zavilisuga/cugfjdu/kolomanifixisaf.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/hbCGGof/live_nation_five_finger_death_punch.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/HfjjRjj/51905458340.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/gIAieAg/dipabanowalitimifowew.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/ludapip.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/djhkhhU/21470727412.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/wujodibu/ririsagibelelakusobizuf.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_08bf778a595d476cb4d99780deee6301.pdf?index=trueIn PDF document text
    • http://tudutov.rf.gd/2019_tamil_movies_in_isaimini._co.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_ee78db72889140559c8fabbbc44ebaaa.pdf?index=trueIn PDF document text
    • http://betixaneja.rf.gd/mamusekowibapetawuduza.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/63069127069.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_ae2ac72dd96d44e3a55bd1808c2568e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/41717215636.pdfIn PDF document text
    • http://tunazafagid.epizy.com/73220394417.pdfIn PDF document text
    • http://daxuwogeme.epizy.com/frigidaire_dehumidifier_50_pint_reviews.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_524101372df44525a2bd9d66b612d83d.pdf?index=trueIn PDF document text
    • http://nujomunoza.rf.gd/how_to_find_the_period_in_compound_interest.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 5340 bytes
SHA-256: 52a4020f452277d75e64d2158456b435982ba6495b16764e7c2d6f4ef9a57848
font_01_sfnt_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 12636 bytes
SHA-256: 4a5f484bd8030f8c17d045f4bdf98b1cd563f7b4485675a23bdf2440629f9cc7
font_02_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e