Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ece8eedb6e5737…

MALICIOUS

PDF

81.5 KB Created: 2021-04-13 18:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d47654e8699f5a6e5b530c2fc33a18b4 SHA-1: 976e242142e5f1b85f3244e7dce6f7321d5e1111 SHA-256: 71ece8eedb6e57374f8d131a4fc7789097d5f19e3c51e354824252905802bc1d
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 disguised as search results for product manuals. This technique is commonly used to direct users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=aroma+digital+rice+cooker+manual+arc+996
    • http://fawetugamuxix.66ghz.com/sheet_nhc_kht_vng_ma_xun.pdf
    • https://nawuwisenaz.weebly.com/uploads/1/3/5/3/135318134/rezugupulabijuxotat.pdf
    • https://cdn-cms.f-static.net/uploads/4382629/normal_602477b0e8ebc.pdf
    • https://cdn-cms.f-static.net/uploads/4458618/normal_5fe9c4fc44da6.pdf
    • https://cdn-cms.f-static.net/uploads/4422914/normal_604cd77053417.pdf
    • https://mutomutozuso.weebly.com/uploads/1/3/0/8/130814133/ritugitefasute.pdf
    • https://cdn-cms.f-static.net/uploads/4471992/normal_60322039ab80e.pdf
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5ffd7d0be5cc3.pdf
    • https://cdn-cms.f-static.net/uploads/4487200/normal_601f1ff3c71fe.pdf
    • https://jowetetezuvam.weebly.com/uploads/1/3/4/7/134717416/26e9ace.pdf
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/jebusutinuvipafaz.pdf
    • https://cdn-cms.f-static.net/uploads/4417827/normal_6039434cf3446.pdf
    • https://cdn-cms.f-static.net/uploads/4386074/normal_6023686d8e0f1.pdf
    • https://pusuxefemaj.weebly.com/uploads/1/3/4/1/134108889/d87e0a9c2490c6.pdf
    • https://static.s123-cdn-static.com/uploads/4423715/normal_6007e3f1c9eb6.pdf
    • https://static.s123-cdn-static.com/uploads/4499958/normal_5fffcc3d8cc5e.pdf
    • https://cdn-cms.f-static.net/uploads/4380223/normal_603cbe882e4d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tipixerokofor.epizy.com/fomosepuwibopenevuz.pdf
    • http://bokatamekal.rf.gd/civ_5_harald_bluetooth_guide.pdf
    • http://siwebojik.epizy.com/offline_advanced_english_dictionary_for_android.pdf
    • http://pidejekakej.epizy.com/85791317827.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_off0000fb3d.bin
537e65c0e5e38bd23b7052cc49ad84d0bcded1fc97f9463ff09561aea4b9bbc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 5444 bytes
font_01_sfnt_off00010da9.bin
42f9b4876616780f588b7b1490a533d7cdad749b3a2bf2156d62e7ae875ae2f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 13356 bytes

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