Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4eaa54b760d8f83…

MALICIOUS

PDF

86.1 KB Created: 2021-02-16 22:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 772bfc0ab93fa054bf9aa2ce9d65f6fd SHA-1: 7e65d8113643505acf62f86201c1497d70123865 SHA-256: b4eaa54b760d8f831fee2b231ad3350609752fb5584f465d587c273a97b35d9a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with several pointing to known malicious redirectors or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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
  • 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/strik?utm_term=python+3+tutorialspoint In PDF document text
    • http://wusujobarowi.22web.org/d_d_5e_guide_to_ranger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_6024275273c41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fc6f1c7a0e42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5fdc18bc8fc3c.pdfIn PDF document text
    • http://gufutaca1.xyz/learn_japanese_for_free_with_kawaiinihongo_apknjhns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_602972b76f923.pdfIn PDF document text
    • https://silagonamep.weebly.com/uploads/1/3/1/4/131452845/c76230f1dcbf3f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5fd17e6dacc63.pdfIn PDF document text
    • http://bekasopeli.22web.org/say_something_lyrics_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_5fd3b6730ffc2.pdfIn PDF document text
    • https://giridoxaxe.weebly.com/uploads/1/3/4/7/134703098/5b005022489e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412891/normal_5fe0a85bf2415.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fdd698fb22cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://poduzamilikuki.rf.gd/fafapivadun.pdfIn PDF document text
    • http://mopezuvo.epizy.com/beatles_classical_guitar_sheet_music.pdfIn PDF document text
    • http://dirujuwut.epizy.com/classical_cesarean_section_operative_report.pdfIn PDF document text
    • http://lewimidofi.epizy.com/because_im_happy_song.pdfIn PDF document text
    • http://jinesiwi.epizy.com/external_cladding_sheets_bunnings.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 4940 bytes
SHA-256: fa3ed1f0756004555256160cfa027505a4bc237c44fe929db63c90de38860462
font_01_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 11700 bytes
SHA-256: 2f4622fb98c2b3506cf7e221cc8894c2c255d2d2835c9f8cc74840a99778f505
font_02_sfnt_off00013cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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