Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1c6e3f66ee928b…

MALICIOUS

PDF

74.0 KB Created: 2021-02-24 00:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6286c362bf25a63d270aa92587342c50 SHA-1: df7c18ed8bfd51f18da27cc48023d9504baddd31 SHA-256: 6a1c6e3f66ee928b66104c0eadf6d5456062bfee240f71fd02a218e23e7822f4
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'cissp all in one latest edition' and 'wkhtmltopdf', suggesting a lure for potentially pirated or outdated technical material. The embedded URLs, such as 'https://crophysi.ru/strik?utm_term=cissp+all+in_one+latest+edition', are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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=cissp+all+in+one+latest+edition In PDF document text
    • https://cdn.sqhk.co/tubafejog/hal4xcO/deal_of_the_day_reizen.pdfIn PDF document text
    • https://cdn.sqhk.co/gunobawiwax/8S5tZii/malajanokenumenufep.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/AjdQ1ju/85798810127.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/jidPzft/pagonupudoxalowifisomun.pdfIn PDF document text
    • https://cdn.sqhk.co/kabawamurelo/hjhdicL/jukisisopagasewexawiwowa.pdfIn PDF document text
    • https://cdn.sqhk.co/kadukugobug/enXzOhd/amaze_heater_review.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/Yjige2v/gajetobugojulapuje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388178/normal_5fe471375d2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_60125e4a24539.pdfIn PDF document text
    • http://zufejexilovexik.22web.org/vajufokimok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404124/normal_5fc6d6a2d5633.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vazisi/dusopif.pdfIn PDF document text
    • http://saziwujezad.epizy.com/xupoxutakexerop.pdfIn PDF document text
    • http://jolavewavesuj.epizy.com/kefevupozebide.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/54823769761.pdfIn PDF document text
    • http://ponogifivow.epizy.com/vedokopojetujubavo.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_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 4764 bytes
SHA-256: d6edcdaff6775fad29f8fc325c0295f129c3c78eacc05715137e2d16ad6c79c5
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 11268 bytes
SHA-256: 2974f7afdf95522503745ec1b253d248ee328e4fd1172112dbfae3d43786d73b

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