Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a9a86e9cf9ef22…

MALICIOUS

PDF

79.3 KB Created: 2021-02-16 07:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c684b8140fea8b8ba51a449d63d8dd55 SHA-1: 51908bfa2b9e106b72cf4ef83df2f2bd1bafbdb3 SHA-256: 01a9a86e9cf9ef22d3c91d1bbb6bd4a0eb2d33915e9ed14fec75a395a5ab31b7
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with search terms related to GPS tracking devices. It also hosts a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically noting phishing and trojan characteristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=best+small+gps+tracking+devices
    • https://cdn-cms.f-static.net/uploads/4415073/normal_6025ef9f5f4d6.pdf
    • https://cdn-cms.f-static.net/uploads/4495399/normal_6019d7e590e9a.pdf
    • https://static.s123-cdn-static.com/uploads/4493589/normal_5ffd041100ef1.pdf
    • https://xelopapet.weebly.com/uploads/1/3/0/7/130775154/421baf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulujono/sample_fire_risk_assessment_template.pdf
    • https://s3.amazonaws.com/kegovev/75434421035.pdf
    • http://kovefevejafuk.epizy.com/kuvabatutisafegisorew.pdf
    • https://s3.amazonaws.com/tiduro/29309103594.pdf
    • https://s3.amazonaws.com/ragejufa/pupusogowikuviwojotatur.pdf
    • https://s3.amazonaws.com/mokixetat/pros_and_cons_of_obamacare_answer_key.pdf
    • https://s3.amazonaws.com/wisuw/13373732030.pdf
    • https://s3.amazonaws.com/sudevejerifu/process_of_atherosclerosis_formation.pdf
    • http://sejonigimanam.epizy.com/hortonworks_hadoop_hive_odbc_driver.pdf
    • https://s3.amazonaws.com/rogugagatuf/23955687417.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74e.bin
df0206aeb34504d94ec440fccaae8a7b83c1b458dd5bdf2bb4fd97378e915fef
pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 5564 bytes
font_01_sfnt_off00010a2d.bin
b794544408727a872f69e10460ea1d2949f22a35cdf74ea709b53167b3b693ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 11116 bytes