Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb9e577e9fd70a2…

MALICIOUS

PDF

75.0 KB Created: 2021-01-20 10:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9c6ce192d01bb8f785c1d8dcb77144a4 SHA-1: e9bde057ceacd6b49cd307d633d9bb97b1e61328 SHA-256: adb9e577e9fd70a28dd23b71e4f57702a43bbc9dc2c45c4782fc927ce3cd534a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to external URLs like 'https://traffking.ru/123?utm_term=how+many+calories+in+a+ribeye+steak+oz'. This suggests a phishing or scam attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffking.ru/123?utm_term=how+many+calories+in+a+ribeye+steak+oz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5fbe951963877.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/Jfhjhjb/xawek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_5fe5eebe9babd.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/fQggdK7/genetic_eye_disorders_list.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/hqfQTvM/voretetovinejud.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/aQHjdfA/45694769271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fec2303dc229.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/YZhbPgi/senior_brand_manager_salary_nyc.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/lakafilurufoji_takifuzavakirax_kared_jonorat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5f9db065c78f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f8d51ed177dd.pdfIn PDF document text
    • http://netusikofigo.22web.org/bakeje.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/zodawanuror/root_unlock_my_android_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/bride_chucky_full_movie_free.pdfIn PDF document text
    • http://nulesuli.epizy.com/sulazadutoti.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/badoo_apk_android_4._0._4.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_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 5352 bytes
SHA-256: 61aae06c5719245ba0fd58a5e08400a0fbc292f31ce4418ebcdd5148bd6399dc
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 11004 bytes
SHA-256: 1e761c1cda500c8f9bea6f44eb7bc2af3ddbb3632ad1aad92776b13b64d7f853

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