Malicious PDF — malware analysis report

Static analysis result for SHA-256 132a8a9402a7928c…

MALICIOUS

PDF

88.2 KB Created: 2021-03-31 09:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61440f0e5c59dc50c293b1542e33a0e8 SHA-1: a2477760d06d8ceb8a008cd65309393dbd907dba SHA-256: 132a8a9402a7928ce8f7167fb8b813a2b1cc1d3db2fc43229a0abd71a9da32d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files hosted on platforms like Weebly and sqhk.co, suggesting it is part of an SEO spam or link farm operation. The embedded content, though heavily obfuscated, indicates the file's purpose is to redirect users to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=video+storyboard+template+pdf
    • https://bugajikiwolano.weebly.com/uploads/1/3/4/4/134471946/sijedobuposaku.pdf
    • https://cdn-cms.f-static.net/uploads/4454286/normal_6033b970d871a.pdf
    • https://nateguwab.weebly.com/uploads/1/3/1/4/131453796/16ddb440fbf6.pdf
    • https://cdn.sqhk.co/teketerep/gQhhhgW/living_alone_2_boyfriend.pdf
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/goxesirepopimu_jafokef.pdf
    • https://cdn.sqhk.co/kupodakojav/icRjhjj/bajovutukofef.pdf
    • https://jalusuduzewot.weebly.com/uploads/1/3/1/4/131456012/928881.pdf
    • https://cdn.sqhk.co/sofetarunox/HTiijhB/fobevalamamotaluxilonap.pdf
    • https://cdn-cms.f-static.net/uploads/4416494/normal_6055167f7ed06.pdf
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/3230866.pdf
    • https://lopepuru.weebly.com/uploads/1/3/4/3/134320072/5e7b7ce3707.pdf
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/fibemedexumavowi.pdf
    • https://zowajapizuxazo.weebly.com/uploads/1/3/0/9/130969341/jojuzibawuf_musoxoledefuj_lepaz.pdf
    • https://moxofeloxivaxig.weebly.com/uploads/1/3/4/4/134438573/d38c0481da2d.pdf
    • https://zozolesib.weebly.com/uploads/1/3/4/6/134631165/e24e42b06.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bofametif.rf.gd/1697771730.pdf
    • http://gukewaxubi.epizy.com/91065448885.pdf
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_d05b848f84404d35840c982a0ee1f5ed.pdf?index=true
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_959d6395ff95490e9a0af8306b91ea10.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d7f.bin
c53d12299655ede3e4d2efc8f08f2783d0eefa5a35ff54178ec0aa92475583e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 5076 bytes
font_01_sfnt_off00011ec5.bin
b09c3144d40cf5316607c71c4f69bc41f7ec74dc0d93e9be0075841b4ec674b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 11328 bytes
font_02_sfnt_off00014540.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 4324 bytes

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