Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d359d24a5dcab77…

MALICIOUS

PDF

86.0 KB Created: 2021-04-13 07:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4acaac656d9e08bf69bf1ebc0cfc9e22 SHA-1: 21fcfa683450c9c714ea64b74ef0bc3c584cfe21 SHA-256: 1d359d24a5dcab77cf90e392cc8d14cc7229cd4988a6ebcf4924b4f8276c5385
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using a search-engine-optimized redirector to disguise the malicious intent. The embedded URL, https://vilenefex.ru/strik?utm_term=craftsman+air+compressor+parts+home+depot, is likely the primary destination for the phishing attempt. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious behavior, likely involving redirection to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/strik?utm_term=craftsman+air+compressor+parts+home+depot PDF link annotation
    • https://cdn.sqhk.co/pasededi/iiig9ic/eggnog_brandy_ice_cream_recipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fd1a890c7005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401716/normal_603d0b53ba3ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_6064a74521c5b.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/igjZ4gd/98413167374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_5fd0f9193f724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458394/normal_6003fd1542ab3.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/jhfTTha/34222561005.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/ghhavvA/81392012775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_602491d5d38c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_602b7b6b3321c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_603945320e712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_604045bc5cdf9.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/jetgdhi/vodikowinakezofalukinuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501212/normal_60679dba33328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481053/normal_60034d89652aa.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/bb741e43-609b-456b-8b69-f103706018e8/61219037756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c46478-4f98-4bcb-ae19-791900124a3e/xemiraladobopejosefixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd6852d-0d6f-498a-a584-c8f85be46774/how_do_lionfish_adapt_to_their_environment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3d5b76-0a65-46bd-a845-d5f44a84e4d9/how_to_clean_filter_on_samsung_front_loader_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abad2130-67c3-4401-96e3-99b9ff01d4ea/coleman_nxt_roadtrip_grill_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a730f40-690a-48ea-9389-6f1b13b0a9d9/40636542754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f934285b-8273-4d9a-8db9-9387a6e49622/what_was_the_main_purpose_of_the_pyramids_in_ancient_egypt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1923f4-432a-481e-a64f-19666f5abb67/gififufe.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_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 5268 bytes
SHA-256: 8b98c33707adcf6edc1e1c09b7e716d7a861947e23849abd8ce2041e7a09d624
font_01_sfnt_off0001236f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 11488 bytes
SHA-256: 5d3eaecd3fb338046d420c1ecb19e46a38f9e720208df037a9a0bc7770aef723