Malicious PDF — malware analysis report

Static analysis result for SHA-256 290869332a612e77…

MALICIOUS

PDF

71.9 KB Created: 2021-03-06 08:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93f4a43ae441a9f702b60e40890940f1 SHA-1: 51ef693031b9171e2d805e3ce435dff420e4ef36 SHA-256: 290869332a612e77763bec560e827d6e5f40ed5beecddf160c4f8881777213fe
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 dynamically generated, indicating a link farm or SEO spamming attempt. One of the primary URLs, 'https://ponafet.ru/123?utm_term=punctuation+marks+worksheets+pdf+for+grade+2', is flagged as unknown reputation and is likely part of the malicious infrastructure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/123?utm_term=punctuation+marks+worksheets+pdf+for+grade+2
    • https://cdn-cms.f-static.net/uploads/4490920/normal_5fdc23ac70cca.pdf
    • https://daradila.weebly.com/uploads/1/3/1/4/131438164/1750289.pdf
    • https://static.s123-cdn-static.com/uploads/4447631/normal_5fe2db0e8c671.pdf
    • http://tifoxikutawe.sportsontheweb.net/95216711658.pdf
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/9961807.pdf
    • http://fuvisetitisenon.mypressonline.com/butesumuvidobo.pdf
    • https://xazegonegexedej.weebly.com/uploads/1/3/2/6/132683071/lemejedubaw.pdf
    • https://cdn-cms.f-static.net/uploads/4391899/normal_5fdc3725e09c8.pdf
    • https://pusemekit.weebly.com/uploads/1/3/4/6/134680760/3fe47db583dcae6.pdf
    • https://bokitixeloto.weebly.com/uploads/1/3/5/3/135344606/4240736.pdf
    • https://cdn-cms.f-static.net/uploads/4367644/normal_60240ed353713.pdf
    • https://nedixizudunosil.weebly.com/uploads/1/3/1/4/131483200/zipive_lirifuzufujut_mamuduvarixe_jolez.pdf
    • https://nurinakeviwiket.weebly.com/uploads/1/3/1/4/131407921/vuwanunir.pdf
    • https://static.s123-cdn-static.com/uploads/4382627/normal_5fc7965793975.pdf
    • https://cdn-cms.f-static.net/uploads/4427105/normal_6017cf4a4058a.pdf
    • https://cdn-cms.f-static.net/uploads/4451375/normal_603813a48bc1e.pdf
    • https://gumotamilo.weebly.com/uploads/1/3/5/3/135319527/7537671.pdf
    • https://gomujivas.weebly.com/uploads/1/3/5/3/135321586/lizonefoviwomopijox.pdf
    • https://cdn-cms.f-static.net/uploads/4496818/normal_603045be18f24.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_52b0031aff1c43d0a8befad905fd3a38.pdf?index=true
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_2d89dba149264e6891bac5dd2569bf35.pdf?index=true
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_b9041759fb8448d1bccc482a45b926cb.pdf?index=true
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_12a5a2cd486d4b3f935956bac2c52b9d.pdf?index=true
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_9c3c0241969b4748830a56b5c98bcc2c.pdf?index=true
    • 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_off0000d919.bin
40dc68e1d99ff859bc37c6c570fa5dd37c0ea4459c84d552ada376002eb544b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 5824 bytes
font_01_sfnt_off0000ece1.bin
fb880c46549e8253ac574e1e1bc473c24111ec0d05bab565688955d8cc6d0d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 10692 bytes

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