Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca723b574a1d8e8…

MALICIOUS

PDF

79.8 KB Created: 2021-03-28 17:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b6f97ec0bad69b4f7592310840670dc SHA-1: 7a643117a43a499a419e269efa70ceff99a740c2 SHA-256: 5ca723b574a1d8e898aaea5f86a8efdc572e68e492fba4aefbbcab155a157e32
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a PDF link farm, indicating a large number of external links. One of these links, 'https://nipisod.ru/aws?utm_term=trane+humidifier+solenoid+valve', is embedded in the document and appears to be a lure. The ClamAV detection and ML classifier also flag this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of link farms and phishing often involves JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/aws?utm_term=trane+humidifier+solenoid+valve
    • https://latovadavubu.weebly.com/uploads/1/3/4/7/134716683/natonumesi.pdf
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/1ff3c6.pdf
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/xaxiju.pdf
    • https://satuvimafinob.weebly.com/uploads/1/3/0/7/130739393/a8b4c.pdf
    • https://static.s123-cdn-static.com/uploads/4444622/normal_600738555839f.pdf
    • https://nuguserofaj.weebly.com/uploads/1/3/0/9/130969707/xakoriwiwejawemoru.pdf
    • https://cdn-cms.f-static.net/uploads/4409630/normal_600e03172a3c1.pdf
    • https://cdn-cms.f-static.net/uploads/4416149/normal_600ff832a7f19.pdf
    • https://rasetevipumi.weebly.com/uploads/1/3/4/7/134714044/1321704.pdf
    • https://cdn.sqhk.co/dalubevemex/hahhsHa/gexorofakukabafixonezek.pdf
    • https://cdn.sqhk.co/gisusisabez/jjuPijd/lojumijiranuneniv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bupesejirijejus/jenilimuzipaguxelogumin.pdf
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_374af087ebc342a68a545ba9137e0b95.pdf?index=true
    • https://s3.amazonaws.com/nonabafat/animal_crossing_animal_guide.pdf
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_3202c9115d974382b7e894e1a7805937.pdf?index=true
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_bb47159795f34c488ee835ee5d377e8e.pdf?index=true
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_4219366d2a864d7e8c64e4c304abe6a1.pdf?index=true
    • https://s3.amazonaws.com/sutawowirosuvuv/bongo_drum_information_in_english.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/64097150049.pdf
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_50aeb0866b4b48f2812137504c7e1f61.pdf?index=true
    • https://s3.amazonaws.com/xalasawu/buderus_gb172_t50.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_off0000ede8.bin
1d30944b94d3df7d27a31f10327ca5eded9ce1beaa812e51f4d86ac43a8bb01e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 4956 bytes
font_01_sfnt_off0000fe8b.bin
0f5bbedda874eb8ae366c970b9fcbb4e89a7cc3c32ad77130b5098352795ee55
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 10916 bytes
font_02_sfnt_off000123d7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 4324 bytes