Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2495d22dcb88391…

MALICIOUS

PDF

58.4 KB Created: 2020-11-11 07:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 352e9019e51b7942770d607762ce6404 SHA-1: d48d0aed68c056d2ec47417b8df42c0e786726bf SHA-256: d2495d22dcb883918cb33410bcdb39ad42c7a2b37dceef64c2e948dc34ad7a63
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, identified as a PDF link farm. One of the primary external links points to a URL that is flagged as unknown, while another points to a confirmed benign PDF. The ClamAV detection and ML classifier strongly indicate maliciousness, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The PDF's structure and the presence of numerous links suggest an attempt to manipulate search engine rankings or direct users to malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?keyword=mr+answer+pr
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f8c3a9989d24.pdf
    • https://cdn-cms.f-static.net/uploads/4384307/normal_5f9a98ea7d747.pdf
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5fa30f84724b2.pdf
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/ratade.pdf
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f8a31b341015.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f8b09e6d2c02.pdf
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5fa949499aa83.pdf
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5f8f67ad8b9e9.pdf
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f8b96e0deb36.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f8729b901345.pdf
    • https://bizavurodetilu.weebly.com/uploads/1/3/4/3/134391156/5806827.pdf
    • https://cdn-cms.f-static.net/uploads/4413469/normal_5f94f4df2333f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/felasorarabipis/xirejubojadipagalu.pdf
    • https://s3.amazonaws.com/wazotojemov/umbrella_academy_comics_plot.pdf
    • https://s3.amazonaws.com/zirojopemup/manual_for_cuisinart_coffee_maker_ss-15.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_off0000ab52.bin
8cb5e335adfd22dafd036d3eab08a06b746ed82dcfc5b4f8996a856544357635
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB52 4876 bytes
font_01_sfnt_off0000bc15.bin
efff530b9d263b4e205b7647c5c312ab77b53418b9ef8f86a393c36f5c0523ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC15 9812 bytes