Malicious PDF — malware analysis report

Static analysis result for SHA-256 95af35836601a476…

MALICIOUS

PDF

71.4 KB Created: 2021-02-19 22:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7a82adaede8683a8d9194d570b887bed SHA-1: 06f2e076b087f8d205d47903ba6afcabbff49cbc SHA-256: 95af35836601a47675af7c19b683b58f05ddbe69503664980846f6ab72890c72
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, characteristic of a link farm designed to manipulate search engine results or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=how%20do%20i%20use%20my%20hamilton%20beach%20rice%20cooker PDF link annotation
    • https://cdn.sqhk.co/mikedeto/DrxmigM/61913989376.pdfIn PDF document text
    • http://creditscoretracking.info/97194073863f5kw8.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/ggHaiaB/electrical_calculations_pro_7._2._3.pdfIn PDF document text
    • https://noresewikikizi.weebly.com/uploads/1/3/1/4/131453465/bupuj.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/jdEicic/juwigaluk.pdfIn PDF document text
    • http://prostochillforum.fun/research_proposal_examples_psychologyy4250.pdfIn PDF document text
    • http://strapslap.online/amazing_grace_piano_lyrics539ud.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/jcieXhf/mobile_data_switching_iphone.pdfIn PDF document text
    • http://xexogafuko.22web.org/daily_mirror_crossword_puzzle_answers_for_today.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/ihjQHps/35006761429.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/pewuz_pukowasute_bovegoba_jitigixowuwaziz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pipikujawi.rf.gd/vuxefopiput.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/75562915319.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/horse_riding_tales.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/idsa_guidelines_for_treatment_of_pneumonia.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/is_delonghi_a_good_brand_for_microwaves.pdfIn PDF document text
    • http://javasuk.epizy.com/39160070608.pdfIn PDF document text
    • http://nojavunol.epizy.com/47616449567.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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 5540 bytes
SHA-256: 1c3f389197619524f96b192592bfa77b2f3498c0b8289a260ca741873a1e44ad
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 10852 bytes
SHA-256: a6c3b55a582318a2d4e561d826e910cebefa77d5d799bb53d962ff3068466f4a

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