Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71251de423131b1…

MALICIOUS

PDF

67.2 KB Created: 2021-02-28 11:17:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e7675c33c3c6e6ddcbecbd72c5c648a6 SHA-1: afafd5f53a26465e428c5a6ebe84e0836c296922 SHA-256: a71251de423131b1ed04aa37d00ca34614be6852898af5bf5ca93a727be705b3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to potentially malicious content. The embedded URLs, such as 'https://soxebez.ru/strik?utm_term=ms+word+for+mac+free+download+full+version', are likely used for phishing or to serve further malware.

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://soxebez.ru/strik?utm_term=ms+word+for+mac+free+download+full+version PDF link annotation
    • https://pepesavujol.weebly.com/uploads/1/3/1/0/131071240/4211580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420597/normal_6000c0070ace4.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/jheidKg/download_street_racing_3d_mod_apk_2019.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/3814078.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/yijihfL/vunijibefodam.pdfIn PDF document text
    • https://tedagenuv.weebly.com/uploads/1/3/2/6/132682668/xupawerivosumoboziw.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/jaaiigj/31105815600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_602f117253f6e.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/chahcLL/slack_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/hgehhAQ/word_tower_crosswords_answer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_6032e1bcdad3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_6020575de3305.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/jTBm3ih/free_weather_radar_app_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_60177f067552f.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/ibmkNib/baleburov.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/9605104141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redifigikutusoj.myartsonline.com/a_fine_balance_audiobook.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/stevens_320_field_security_12_ga_28_barrel_5-rounds.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_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 5324 bytes
SHA-256: d03742655b45cbc514ddbdacf7aedf0a4c077a01c4542739e175b92dbc90e35e
font_01_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 9972 bytes
SHA-256: fcd33eb9bd1eb3059e164175ebc0163b9976a14995cc032603cc97541e55a62d

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