Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c474baa8e845bb…

MALICIOUS

PDF

80.5 KB Created: 2021-05-05 14:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 39df1e5e3e0286e13a1e67830bd11a9e SHA-1: 57f58611d1a3eff85d9d812974c3ac664ab0e106 SHA-256: 35c474baa8e845bb5d6921b21784860522ef07d0aeda1ce42ce2a32c72f061e7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=gta+v+crack+%252B+activation+key+generator+download PDF link annotation
    • https://lowunidedalovel.weebly.com/uploads/1/3/1/3/131380213/6158888.pdfIn PDF document text
    • http://jokebixa.22web.org/xijenikegutekunamojo.pdfIn PDF document text
    • https://gefimopawudomew.weebly.com/uploads/1/3/4/0/134017284/gitogabidelepopumo.pdfIn PDF document text
    • https://wojulifurezusek.weebly.com/uploads/1/3/1/4/131438898/5467822.pdfIn PDF document text
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/87c389fed45ffe3.pdfIn PDF document text
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/0d52790286ce.pdfIn PDF document text
    • https://tamegafatukof.weebly.com/uploads/1/3/4/4/134400059/tipujurawa_gumag.pdfIn PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/vetudog_kavapumixude.pdfIn PDF document text
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/68fd2017880b062.pdfIn PDF document text
    • https://welukixavise.weebly.com/uploads/1/3/1/0/131069839/dirufisir_zepewezi.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/text_features_5th_grade_powerpoint.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/puwukalagised.pdfIn PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/junim_magelawagugo.pdfIn PDF document text
    • https://kuxokovu.weebly.com/uploads/1/3/0/7/130738635/170657dcd49f5.pdfIn PDF document text
    • http://fomoregekamikat.mypressonline.com/jumifuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxumokuri.epizy.com/paper_cutting_and_folding_questions.pdfIn PDF document text
    • http://webukoxaxox.rf.gd/what_does_proverbs_30_5-6_mean.pdfIn PDF document text
    • http://wopojofa.atwebpages.com/72218717380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6163d33c-b68f-4412-8eb3-f07970e813fd/37883261453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4b33cc-16a8-4500-88d5-802244d7c048/number_flash_cards_printable.pdfIn PDF document text
    • http://najexenij.onlinewebshop.net/ielts_grammar_for_writing_and_speaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb644ea-f412-4053-bdc0-ef806a081803/98711491387.pdfIn PDF document text
    • http://vudagolefedofa.epizy.com/additives_in_plastics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5a9bec-ae79-4e13-9971-626975f595bf/twilight_part_1_full_movie_online_free_2008.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_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 5280 bytes
SHA-256: 2c082ba7d00c15031e81d60074f67956925831238e09d6e54c78ed4b53f4909b
font_01_sfnt_off00010f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 10760 bytes
SHA-256: 99d773ded7f96aaf8018e2de95f47b62ee892b58768b2fffbd573c4925701cb2