Malicious PDF — malware analysis report

Static analysis result for SHA-256 925f1ef05b4eb461…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 01:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6a1b30edb3bad3d670eeee24020692c6 SHA-1: 28219be3c049dd1492bc3664209c36bcd28f6fa2 SHA-256: 925f1ef05b4eb4612806fa971a791809185b078556593eb6ade07ef2a6609f93
244 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting, and one critical link redirects to known malicious infrastructure. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the embedded links and the PDF's structure strongly suggest a phishing 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=advantage+and+disadvantage+of+technology+pdf+download In PDF document text
    • https://cdn.sqhk.co/neganobasiwe/8hbjh6k/giwosipid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_605128226a7b9.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/jeRhjiD/87511734764.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/kifggie/xujofodujerij.pdfIn PDF document text
    • http://giftcard-sale.store/96045253226dsq1q.pdfIn PDF document text
    • http://oneplusonemain.xyz/jewexevadimonedaxomedisi78ue7.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/Bt69zic/xfinity_race_today_live.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ff75c7016b35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_602b69966a174.pdfIn PDF document text
    • https://cdn.sqhk.co/tipapija/0hifidq/27970656841.pdfIn PDF document text
    • http://design-kvartira.info/2970000146005ew.pdfIn PDF document text
    • http://icily.xyz/chemistry_of_carotenoidslq7jw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojonuta/65028284284.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_79c61512ec7c4fb0b41b2ab4ec69959a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/free_blank_sheet_music_to_print.pdfIn PDF document text
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_9a69c3865f2c4375a658eb06d9da0bdb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/classification_of_antibiotics_and_their_mode_of_action.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/city_of_ottawa_recreation_guide_winter.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_2cd68cd8c3e947d0b4de0a83209ae2e4.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_d45b95e874374be49c20d8af21397317.pdf?index=trueIn 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_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 5564 bytes
SHA-256: 63445ea3701d7441409f8fd7654f1fd9ac3a7ba782b323d0ebbdcc0381e5b1d5
font_01_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 10648 bytes
SHA-256: 282dbdf73313c922da94d9b8c751750768390ad9aba6cd03b6cbf33a0cdcdcba