Malicious PDF — malware analysis report

Static analysis result for SHA-256 a154701a2d477050…

MALICIOUS

PDF

70.1 KB Created: 2021-03-26 06:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6bd8c3ea8412193300226d0afe99eec SHA-1: dc9197f246487179d2cbcd478a8b67cf9b76cd08 SHA-256: a154701a2d477050646183a342302bbcd676849c0cfd3edb3a92b908fdd59b6d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable or unknown domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://lozipotod.ru/123?utm_term=aluminum+sheet+cost+canada
    • http://roxopazin.iblogger.org/dekusenoga.pdf
    • http://dutakevekuw.iblogger.org/linux_booting_process.pdf
    • http://desurobiv.22web.org/english_grammar_in_use_elementary_level_test.pdf
    • http://fudipowituvu.22web.org/vofuveviwizosebokinuzugud.pdf
    • http://morosoxumexax.iblogger.org/kataritugis.pdf
    • http://dazarutos.22web.org/metaphor_definition_and_examples_wikipedia.pdf
    • http://vobigabifinu.22web.org/77951549302.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_62d5950b477c414c936e5dfe7ccac480.pdf?index=true
    • http://likasiz.epizy.com/astrosage_app_apkpure.pdf
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_5e1dbd64e8ad49e98b5b7a445c1668d2.pdf?index=true
    • http://fuvudox.epizy.com/gedanupulajaza.pdf
    • https://uploads.strikinglycdn.com/files/4ff77ad1-1658-4e38-9b9c-2d81a35dc55e/gathering_storm_civ_6_price.pdf
    • https://uploads.strikinglycdn.com/files/49e226ec-c783-4353-b10b-18b861de1496/sadubawiwetovakavekilo.pdf
    • http://luwawabegopit.rf.gd/wujuki.pdf
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_3bc3dc65e2034e72875d4a5c8cfd1cbd.pdf?index=true
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_d2662f2c698e4338892fcab83c5bde2e.pdf?index=true
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_ed3a72d88c1e4cffad2e14198c5910e4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a90ea0c-ddd2-42f8-a97c-0f70334a046c/79105162996.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d385.bin
381124472e0f28fb48a5580b6c7f38528138e7652fe368c6de3aacb63a193ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 5072 bytes
font_01_sfnt_off0000e49c.bin
12576ccec08cf41c5c85abdca4da17085ad489a948a660cf90dc2aa2e8a14682		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 10832 bytes

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