Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8108adb242389c…

MALICIOUS

PDF

69.3 KB Created: 2020-12-24 04:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a6b50c44408daf4414633fa6312ebea9 SHA-1: 9a19abebaaca1309b9e9ce935be33e4331a1ac89 SHA-256: fb8108adb242389c6566ba5c59b1179fec6519404f0f8f1983f56a23e62f3a52
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'advertising campaign definition wikipedia', likely a lure to disguise the malicious intent.

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 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://traffine.ru/strik?utm_term=advertising+campaign+definition+wikipedia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f871fe3d22d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_5fda362eedec5.pdfIn PDF document text
    • https://cdn.sqhk.co/wepuvumug/jjzgdgf/sulogekozulupovozemakemi.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/jhhaaXN/cosmic_kids_yoga_pokemon.pdfIn PDF document text
    • https://cdn.sqhk.co/weteroliwo/ig4hbgh/ritusaduvidaral.pdfIn PDF document text
    • https://totobulamu.weebly.com/uploads/1/3/4/3/134310137/7181000.pdfIn PDF document text
    • https://cdn.sqhk.co/gifitebona/jahcuic/lukas_nelson_shooter_jennings_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/Fjjic18/95301212650.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/RiehlQX/note_taking_methods_for_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/fhbheVz/siritu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5fac2ee4a5838.pdfIn PDF document text
    • https://jutivodip.weebly.com/uploads/1/3/4/4/134489611/167212088572d1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5fa708326af2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5fa56fb1877ca.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/febopa/video_status_for_whatsapp_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/wesowewa.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_off0000cead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAD 5648 bytes
SHA-256: 10e597bd5858043b09fcaa66d54a1312da4370c0424c9ea18e66199517e24c94
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 11164 bytes
SHA-256: 47a68b3162fe12ee44f2a8bfa216b6d31926ca92e17561dc6724575795255cda

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