Malicious PDF — malware analysis report

Static analysis result for SHA-256 108a16fb4fbe2be4…

MALICIOUS

PDF

72.9 KB Created: 2021-02-13 18:29:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 23336f99483305bb855b71a16be863f7 SHA-1: 892ea29f2885cb557b733882e1dd5e044dc4ab61 SHA-256: 108a16fb4fbe2be4fca2cbb1a413aa144004cc7b37bfdb114996f4e7994eb870
186 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, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=spacemaker+xl1800+filter PDF link annotation
    • https://joxoxego.weebly.com/uploads/1/3/4/6/134664344/fa19833fba9e61.pdfIn PDF document text
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/godakemumi-waviwazomasab-redebonibukiju.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/IiidIo7/17572594532.pdfIn PDF document text
    • https://lewobagapu.weebly.com/uploads/1/3/4/6/134666085/jatovojalidafo.pdfIn PDF document text
    • https://dofetavazazu.weebly.com/uploads/1/3/1/0/131071127/tibus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479938/normal_60272ab3b02f6.pdfIn PDF document text
    • http://zivudib.66ghz.com/angiospermas_exercicios.pdfIn PDF document text
    • http://sewaseg.22web.org/machu_picchu_facts_and_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_5fe9253d48d71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5feee3b56b0c4.pdfIn PDF document text
    • https://cdn.sqhk.co/velizovatim/hQFhcng/download_ibis_paint_x_pc_baixaki.pdfIn PDF document text
    • https://bakofusu.weebly.com/uploads/1/3/2/3/132303024/vudewovupuji_ruwalidobuw_tixenuj_kamob.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/vonoxipefefapu.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://xumusemowujev.epizy.com/vakekojel.pdfIn PDF document text
    • http://dulefuzobov.rf.gd/tafujewaxigilipuwobi.pdfIn PDF document text
    • http://towidono.rf.gd/lab_safety_crossword_puzzle_answers_7th_grade.pdfIn PDF document text
    • http://wefofumerari.rf.gd/preparation_of_benzoin_from_benzaldehyde_lab_report.pdfIn PDF document text
    • http://sowujakuje.rf.gd/50058281709.pdfIn PDF document text
    • http://safuzidavoje.rf.gd/kolosokadaf.pdfIn PDF document text
    • http://bizurano.epizy.com/587465904.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_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 5180 bytes
SHA-256: 8d68eb8c5f3c7781ad65dda22e06b5d0a243a3db77681583caba1f1e1a5e99e4
font_01_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 10452 bytes
SHA-256: 4ef989067fc9ef450182533991dd795cd4a19dbdb18e5015ef149f737c1d5c09
font_02_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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