Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3402ea82a35fd2c…

MALICIOUS

PDF

80.5 KB Created: 2021-05-10 23:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3a7863116fb1df5603fa1d5100cc9699 SHA-1: e8ed9ef094dcb9d1d3e550abb3ddb26146b9ce87 SHA-256: f3402ea82a35fd2c9770c4a8b8c024e7f60f0479fc7d80de6e6ea4f114390a51
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains and utilizing UTM parameters, characteristic of a link farm designed to redirect users to potentially harmful sites. The primary purpose appears to be directing users to a network of websites for malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=computational+physics+textbook PDF link annotation
    • http://leafester.online/what_happened_in_the_golden_age_of_greeceqhcjl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480889/normal_603e94c1ecefd.pdfIn PDF document text
    • http://dkblogin-de.best/godiwasukujudevilibiwod6d8r.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/rulesuremel-daxorovemuxa-xijebox-zaxivefepefad.pdfIn PDF document text
    • http://kellys.space/spray_paint_menardsvm00p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_6016e29c159d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_600ff2279cdf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fe227794ed44.pdfIn PDF document text
    • https://fewugoxozo.weebly.com/uploads/1/3/4/4/134441687/9377011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450434/normal_604b34c394c89.pdfIn PDF document text
    • http://newsportstechnology.ru/call_of_duty_game_karna_haifzdyi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_6011979debe6f.pdfIn PDF document text
    • http://wirelessinfo.ru/15958287259rxkc.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/648a9574-222d-43da-8f15-62b57e768180/sebegifemijisuw.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_1eb1be765bc84f31ab689d4e1f21fcc3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd49bb10-f894-4d13-8b73-3d8dbfba4f5a/kobalt_compound_miter_saw_manual.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_91ba7211178445aa91d60668b4e4fc84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98ad5f7-167a-4f85-955e-9ada882d8a1f/common_grammar_mistakes_while_speaking_english.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_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 5356 bytes
SHA-256: aa2600715379cde1d4e4df7bbee8e5060ca85846525c1acad174f326027f3ce2
font_01_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 11264 bytes
SHA-256: a037b750e3b251a0ad3e5e67043d00db7434840b9fa56af49afdf1a137e4048d