Malicious PDF — malware analysis report

Static analysis result for SHA-256 af852c2d85ed6623…

MALICIOUS

PDF

71.1 KB Created: 2021-04-21 07:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aef14e55361bf84f0a795b827a873a7b SHA-1: 23a48f6c8eb6ea4da14a8cd99eb688e85769e5b9 SHA-256: af852c2d85ed6623f0cf4fc962b196b47c1cb818bc3a52ab5fb79c743c3b4218
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics identified it as a link farm containing numerous external URIs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'Xanathar's guide to everything new races', likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=xanathar%2527s+guide+to+everything+new+races PDF link annotation
    • http://jesawukimefix.mypressonline.com/gemomobiwaguboreb.pdfIn PDF document text
    • http://puviwaxeraw.22web.org/netgear_wndr3700_repeater_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/v2gggjT/xobogerezexuzedodolokunix.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/iO7jbjb/best_contemporary_christian_music_album_2020.pdfIn PDF document text
    • http://jidiwaxilo.iblogger.org/rudoxividi.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/nidifhf/baldi_s_basics_birthday_bash_mod_apk.pdfIn PDF document text
    • http://sugewute.22web.org/57156486367.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/sakowopevoxorawezisefi.pdfIn PDF document text
    • https://cdn.sqhk.co/sixaxetexaxe/hbIgfG3/gotakabewidodikevas.pdfIn PDF document text
    • http://tifeguga.22web.org/how_to_customize_fl_studio_20.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/LmHhchh/sutumikib.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/ddc40f76-d62a-4ce3-add6-7c6517364370/5038327068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d25402-2b55-4ebb-8f72-7b7acfd6aeb6/72127622121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/721920f5-4b24-4185-9b60-e23237602e10/41889492502.pdfIn PDF document text
    • http://poxabeb.rf.gd/possessive_case_of_nouns_exercises.pdfIn PDF document text
    • http://mivevusewez.epizy.com/8418854724.pdfIn PDF document text
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_ba564b5a62594628bd14f811c8ddc898.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_33e45f62be2e4bb4a47d068598dea81e.pdf?index=trueIn PDF document text
    • http://jibufunipibavu.rf.gd/xuxise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8f06c4-d37f-4ebf-baf6-ee1b28936a1f/18774799855.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_d9188f8c5d41487daf700eae762072d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a217d3-f120-406f-87b6-4b5aa072b900/quantitative_investment_analysis_3rd_edition.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_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 5432 bytes
SHA-256: d81e50971b17959a9b1e4b8426b9553f94489a834f5b4660fd4aa4b07ad7a4e6
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 10088 bytes
SHA-256: b552dffad802bb31ab010dd690c936b7c9e6a815919205fe4fb7cc20bb723553