Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5368f795651c50…

MALICIOUS

PDF

80.5 KB Created: 2021-04-04 21:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93135af48b4095b226c79d1fdb96940e SHA-1: d43f464633d7f4c29fc41c641e72ece3a61c72bf SHA-256: ff5368f795651c50740d6eb6afad38b9175d584e97459bd636723bc08ba180b2
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit users through indirect redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://xezojetit.ru/strik?utm_term=sql+server+notes+pdf+naresh+technologies
    • https://foziwumiwogesis.weebly.com/uploads/1/3/5/3/135321673/xovobukolalomu-nunagos.pdf
    • http://arnautmebel.ru/dell_precision_t7500_bios_settingsa5jue.pdf
    • http://xupenirulavep.iblogger.org/19401980022.pdf
    • http://besefobusim.mypressonline.com/69429650572.pdf
    • https://mopotiwifatuge.weebly.com/uploads/1/3/0/8/130813373/10d168db.pdf
    • https://betivaronapan.weebly.com/uploads/1/3/5/3/135350750/7172645.pdf
    • https://ruxebawinafa.weebly.com/uploads/1/3/0/7/130776533/6918223.pdf
    • http://copyrightproblem.com/hd_wallpapers_for_laptop_1366x768_freey1e9z.pdf
    • https://faniwavuguvupos.weebly.com/uploads/1/3/4/4/134478403/bozoxikogazudiwopu.pdf
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/xisudumatufezuzew.pdf
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/2432243.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tazidafez.rf.gd/31563021343.pdf
    • http://pejibuturu.epizy.com/davalemigorew.pdf
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_b2362912432d4a70be32fc932c6fbf4a.pdf?index=true
    • http://rezexoguseg.epizy.com/78283789833.pdf
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_ffb0eeabf19446ebb7cbd602f4b3fba6.pdf?index=true
    • http://fijazatomowov.epizy.com/adobe_preview_handler_not_working_in_outlook.pdf
    • https://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_4e8db43a538f4e03bf6162fa1b3c62ba.pdf?index=true
    • http://jabodegodonirad.atwebpages.com/lijudo.pdf
    • 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_off0000ecc6.bin
d7524767abdc6dbd998609d393b079b10767beddc626be3db4e0c06d8f2979ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 5496 bytes
font_01_sfnt_off0000ff64.bin
da1f2896c6d008ee1db8c75309bf73042d5ed704a62631f8a1d5c9018dc463c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 11480 bytes
font_02_sfnt_off00012676.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12676 4324 bytes

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