Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b70797c0dd1cf60…

MALICIOUS

PDF

82.3 KB Created: 2020-11-30 19:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6715c96b825cf7eb44ab68332e9e1516 SHA-1: ea23f02ff9c714033daf582de39a110e62928cf0 SHA-256: 4b70797c0dd1cf6017aa70b1b3f20605720a34b4c14ac2906113ba1195ee79b1
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded URLs, with critical heuristics indicating it's a malicious redirector link and part of a link farm. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the embedded links are the primary attack vector, likely leading to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://ggtraff.ru/strik?utm_term=piecewise+functions+ws+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_5f973ea7bc091.pdfIn PDF document text
    • https://taponoranasigem.weebly.com/uploads/1/3/4/6/134643922/jobiro_finev.pdfIn PDF document text
    • https://zanubago.weebly.com/uploads/1/3/4/8/134886268/d27c32c828a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450635/normal_5fbc3fd29bd1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf78df3de5e49b529ec0d/1606285199095/guitar_hero_iii_legends_of_rock.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06d09e5c7695ca9994347/t/5fc3ac675147b14804a3387b/1606659179272/showbox_5.30_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe28c2f3de5e49b52dd6e8/1606297795961/kolab.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1c949ee0f32b871c58b4/1606294676823/69029289254.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/wafuregoz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1318a5bcb0228a2845bc9/t/5fc3b83018e72e5fdb493ee8/1606662193840/acs_official_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/jokafojolaleniboxebum.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 4936 bytes
SHA-256: 0d0e1d933d3f1dfe513a8c327633fcb1e3aecfd2ce96e9df25f32c8b351182bf
font_02_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 10328 bytes
SHA-256: be4ebd930e33511617f6d3969e59ec36899271b6037b6c250684ca3cdd48ef6c

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