Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e5efe82602c7a9…

MALICIOUS

PDF

78.5 KB Created: 2021-03-19 21:31:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2567bebfcd550c1bad9b704eec6d0b80 SHA-1: d64384ec797565659ed00576d5779bbc0c2bea39 SHA-256: a1e5efe82602c7a9fc675568f82df0fae58f2b188f7f648e0b28cb10194189ac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDF files, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/wix?keyword=rebel+xsi+manual
    • http://tophomework.space/318948331i16an.pdf
    • https://vobikonim.weebly.com/uploads/1/3/5/3/135390296/mepewuwe.pdf
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/patakit.pdf
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/nizozanesenuvotozi.pdf
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/laxitasudumigozavo.pdf
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/9243871.pdf
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/3337650.pdf
    • https://barojukiwi.weebly.com/uploads/1/3/4/6/134636353/rumariwepipuwu_refulonugapipat.pdf
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/xugebasologinebalu.pdf
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/e65551d.pdf
    • https://dazomutatif.weebly.com/uploads/1/3/4/7/134729749/nunokemedolukel.pdf
    • http://fbdirect.site/hiv_retrovirus_life_cycle0clqn.pdf
    • http://pitushok.fun/bidilelusuvegibodalapu0adr5.pdf
    • http://kuvuradivikosef.iblogger.org/hermann_hesse_steppenwolf_explained.pdf
    • http://lupelev.22web.org/50106890046.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sorotakadu.rf.gd/35981716261.pdf
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_f87c914b367f4868a5f0f2f0ad1d9b1e.pdf?index=true
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_912abb29c33e4512a2417ba6fe04fe36.pdf?index=true
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_d1251d1191134978b4e6ca42e9953701.pdf?index=true
    • http://vifoxakusawe.rf.gd/android_emulator_adb_shell_permission_denied.pdf
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_bb18a6ef73844e9582b13f4f196cb88c.pdf?index=true
    • http://zufelagek.rf.gd/battlegrounds_full_crack.pdf
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_c4c42fb07bd14b4b9b9557325746a3dc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4fb.bin
9b71aeb3b5be8e96ffd0ffc49d3eb6c7cc3f35dcf1734e927ecef227ddc8ac93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 4952 bytes
font_01_sfnt_off000105c7.bin
978d48a56fd70c572ddeca0360aa00451b551e1c9d03102c61e835826dde2dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 11412 bytes

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