Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0106490b252cc7…

MALICIOUS

PDF

70.6 KB Created: 2021-06-09 04:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4bd14100fbb55dacf6b9791964f21cb0 SHA-1: a9c63f2b5b9cca50c3cf0c1a6e1743d22c856aae SHA-256: 8b0106490b252cc7083e46cbd047a0a8d32fb3d1429a269778eeab3d89740b55
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The embedded content, though heavily obfuscated, suggests a lure related to retrieving deleted browser history, which is a common tactic for phishing or malware distribution. The presence of external URIs and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://laborke.ru/pbw?utm_term=how+to+retrieve+deleted+history+from+chrome PDF link annotation
    • https://bobiwagimozud.weebly.com/uploads/1/3/1/4/131406821/tomalifapizub-dubudokamurekaz-lanidoparezu-simawe.pdfIn PDF document text
    • https://kaxesudinebeg.weebly.com/uploads/1/3/1/3/131379803/zinawugir-fomadup.pdfIn PDF document text
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/walubirefixi-xowukujubike.pdfIn PDF document text
    • https://ginixagizelak.weebly.com/uploads/1/3/5/3/135349131/niwareb-pimonaf-sefeki.pdfIn PDF document text
    • https://jugikezifu.weebly.com/uploads/1/3/4/6/134654678/nitoma-nixopiroxob-gepowufap.pdfIn PDF document text
    • https://ximabetewu.weebly.com/uploads/1/3/1/3/131384229/tapilikotitisepolul.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/64887.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/bozopif.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/3761978.pdfIn PDF document text
    • https://rejigebejone.weebly.com/uploads/1/3/4/4/134462336/f3afdeb168.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/6430309.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/915e8345-4bb1-465e-94f1-29cd02a54210/15680143292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5ffbbe-b358-4b2b-ae13-70333a40e5e6/the_lion_witch_and_the_wardrobe_trailer.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144790032/la_belle_et_la_bte_bibliocollge.pdfIn PDF document text
    • http://kukumepubop.pbworks.com/w/file/fetch/144815094/how_to_play_skyblock_on_bedrock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a385eb6-78ef-4e5d-a898-c567eb91fec4/how_to_pair_sylvania_bluetooth_speaker_sb377w.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/peliredururobobem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa64f40b-4c43-44c3-8479-6bee5285523c/char_broil_smoker_accessories.pdfIn PDF document text
    • http://liguduper.pbworks.com/w/file/fetch/144452562/licencias_para_eset_nod32_antivirus_2021_marzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcbb5afb-f16e-4e80-9920-e17ecd41e0d5/venexufanubakudevunop.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 5264 bytes
SHA-256: fc956d6a257734722c14e47fdcce1235e6183757d681313f944e8b0aed3032a1
font_01_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 10472 bytes
SHA-256: 93aed06a4175dc4e050de6da60581a924b2cd11bb848b5b6de5a8668e355ccb0