Malicious PDF — malware analysis report

Static analysis result for SHA-256 778248b6e60ee429…

MALICIOUS

PDF

79.7 KB Created: 2021-05-29 04:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c72d9fdd7749f82f1a020c59bfbcdda3 SHA-1: ae34091baff07ff4d02fe62e8b8cec0bc4ea8874 SHA-256: 778248b6e60ee429f131f22fcfe40e0fc4a7ddeee1b0810f2268535bf7ad1637
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs and the PDF's structure point towards a spearphishing attachment, with the document body's garbled text suggesting it's a lure.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=livro+de+ingl%25C3%25AAs+avan%25C3%25A7ado+pdf
    • https://tuwureliw.weebly.com/uploads/1/3/4/1/134108737/xizisenira.pdf
    • https://donoreto.weebly.com/uploads/1/3/0/9/130969624/kuwavolenivekexuxiku.pdf
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/zixaxe.pdf
    • https://zudimawavisutet.weebly.com/uploads/1/3/1/6/131606198/fotimasexidoliz.pdf
    • https://fikelepokaretes.weebly.com/uploads/1/3/1/3/131397971/fafilugeruwutuz_kojijosurumim.pdf
    • https://jibabarudemafe.weebly.com/uploads/1/3/4/7/134748102/xonejederexu.pdf
    • https://fejenugid.weebly.com/uploads/1/3/4/0/134016750/4318997.pdf
    • https://suxamoka.weebly.com/uploads/1/3/4/8/134876373/fonedironezotup_xanikixamaxa_bonepokugex.pdf
    • https://wufikasuruxur.weebly.com/uploads/1/3/1/6/131636700/toludarepevebugasat.pdf
    • https://cdn-cms.f-static.net/uploads/4469116/normal_6033ac37a7162.pdf
    • https://static.s123-cdn-static.com/uploads/4445550/normal_600294acaaec8.pdf
    • https://pifabesi.weebly.com/uploads/1/3/5/9/135958575/jutuduwugiparu.pdf
    • https://majujeleku.weebly.com/uploads/1/3/4/5/134590665/sezaba.pdf
    • https://bigubiforuse.weebly.com/uploads/1/3/5/3/135389938/fubamixibiku_fuxonom_rupifem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/613406d8-1849-4a8e-9828-6bbb7f8606e5/what_is_on_aeneas_shield.pdf
    • https://uploads.strikinglycdn.com/files/6fca0b89-df1e-49dc-8404-12108e6fbfd7/song_lyrics_of_seven_years_by_lukas_graham.pdf
    • https://uploads.strikinglycdn.com/files/f293dea3-927b-48d6-bf23-37349c424f44/vififu.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_off0000ea55.bin
15891913bdcc92da94e9d666a49cfefd69a101212d2a160900a3fc75d8106654		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 5252 bytes
font_01_sfnt_off0000fbfd.bin
974f88d92f832e50751826890e437461f5f0ab30ec86fc84bc7613edd4429d93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 12432 bytes
font_02_sfnt_off0001220a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 4324 bytes

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