Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9b8d3cf644889f…

MALICIOUS

PDF

85.9 KB Created: 2021-02-18 23:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c3e3831fcd0a76396939727e144247b SHA-1: 1351dd1c8ed23241dd059162337e418f5c027300 SHA-256: af9b8d3cf644889f4d3c2fd9bb0c0e798018dd30a17b9cf4e158c5848bd6d361
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by both ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of external links, many hosted on disposable domains, designed to create a link farm. The document body, though heavily obfuscated, suggests a pretext of providing a 'wascomat washer manual pdf' to entice users to click these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/wix?keyword=wascomat+washer+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/petebeki/jRk2tPM/calla_lily_plant_care_winter.pdfIn PDF document text
    • https://ponuwusareti.weebly.com/uploads/1/3/1/6/131636782/6803303.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/Kgjehb9/college_football_playoff_national_championship_2021.pdfIn PDF document text
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/kolipevur-fugujenugar-vigosinoxir-kobimidiwif.pdfIn PDF document text
    • https://golizagizaziw.weebly.com/uploads/1/3/4/7/134701046/7995907.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/iigChcT/76971213112.pdfIn PDF document text
    • http://mebutef.22web.org/chicken_invaders_5_game_free_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/dapalufited/1GIje0I/diy_woodworking_projects.pdfIn PDF document text
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/tekisov.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/951215.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/wagulogunosojor.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/ChbWhe0/dog_bubbles_for_fence.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/xivanidowopuju.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/Gn1hjSN/capsaicin_pills_for_pain.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/59ygUfy/jogalekuzuzunedumo.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/irjgQZv/34172306084.pdfIn PDF document text
    • https://kuxapularutamux.weebly.com/uploads/1/3/5/9/135984678/8489839.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/NgdRvjc/metal_garden_sculpture_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/xomorenut/rCZgexB/3602439264.pdfIn PDF document text
    • https://zitupakunetod.weebly.com/uploads/1/3/0/7/130739751/8611882.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tuwafexom.epizy.com/nulomunirebogitibifuvidom.pdfIn PDF document text
    • http://jizuwugi.rf.gd/suverijiroxofivetowajox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 5332 bytes
SHA-256: 8dcaab7e7c7b3666cc728f6943b96be4446d3cdad660493b7aa96cc925c3a855
font_01_sfnt_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 10428 bytes
SHA-256: 3fd38c2f70f2a598de829fada9d982757ae4d84f50b35ba77035c40ebf3efccb
font_02_sfnt_off00013bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f