Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfa8872278d0a09…

MALICIOUS

PDF

77.3 KB Created: 2021-04-05 20:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fecbc892eeb2c7233f9e3309259271d9 SHA-1: cf5201c111384e5bad19457c3cdc667810537281 SHA-256: 9cfa8872278d0a094f6b3d52ffbd2153ae11f5623ca67edd78ccf624ecdb2cf8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links, with one prominent example being 'https://soxebez.ru/123?utm_term=bride+of+chucky+tamil+movie'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://soxebez.ru/123?utm_term=bride+of+chucky+tamil+movie PDF link annotation
    • https://cdn.sqhk.co/tibazafex/hmJid4r/how_to_activate_mtn_pulse_uganda.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/hYjcrne/gudiwuwiguleseguviwurow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490754/normal_6052ab4e38b3d.pdfIn PDF document text
    • https://cdn.sqhk.co/lulamekajasu/hNOjchf/love_letters_to_the_dead_english.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/AvaQibE/12302395264.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/Zzjhiif/movistar_el_salvador.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_6012c61136377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_60618028d739e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374533/normal_5ff223a072402.pdfIn PDF document text
    • http://salufogi.iblogger.org/71547200186.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/iE2jGij/1839645999.pdfIn PDF document text
    • https://cdn.sqhk.co/vusunuvaka/fcTjhhh/us_lottery_application_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460457/normal_5ff0629c2c416.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/bezutu/18918807904.pdfIn PDF document text
    • http://rowomasogig.epizy.com/73170591681.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/tetelanefepumana.pdfIn PDF document text
    • http://tapavakagazu.epizy.com/89762441896.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_15134960f5c741a4887bf4a5235775ed.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_ccb0ca22df3048f9947214fc61cf7606.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_75120ee5270c4a12825afc059d37f4f7.pdf?index=trueIn 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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 5356 bytes
SHA-256: 9a7c32c609c80a95f00ea1dace6eff4f4fc0445c7369d78a4a52cabacdd061db
font_01_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 11480 bytes
SHA-256: 13a87c69c05050ff75428c0ec323ce9b11cc0386e1accc75c268d62a7f6625e5

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