Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b90cbe825eb2dc…

MALICIOUS

PDF

86.9 KB Created: 2021-05-21 18:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd8adb99263aff7744840131d67be9cf SHA-1: 442d674d195552f2bf4520d4afb69fd76e1a3ab7 SHA-256: d9b90cbe825eb2dcb38ab8d831fef4c4483371a0be2b922064caa0c0a88eadd1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam and phishing. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=download+film+avatar+korra+book+2+sub+indo', which likely serves as a lure for users to download malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://resalured.ru/strik?utm_term=download+film+avatar+korra+book+2+sub+indo
    • https://static.s123-cdn-static.com/uploads/4495558/normal_6004ccbdca3e4.pdf
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/xatawawetidokofis.pdf
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/kimawozesigot.pdf
    • https://rumevupalod.weebly.com/uploads/1/3/0/7/130739773/8da754.pdf
    • https://cdn-cms.f-static.net/uploads/4375350/normal_602e6274ed7fa.pdf
    • https://jotipipadazazo.weebly.com/uploads/1/3/4/3/134319758/tezanosogukateniw.pdf
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/bf47e426dd.pdf
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/4668270.pdf
    • https://cdn-cms.f-static.net/uploads/4415754/normal_604cc133c5a16.pdf
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/4523709.pdf
    • https://jovopunok.weebly.com/uploads/1/3/4/8/134869647/c02aac9f033a59.pdf
    • https://cdn-cms.f-static.net/uploads/4403816/normal_604fcb1fdee24.pdf
    • https://momogomuwe.weebly.com/uploads/1/3/4/8/134885938/1f8bc.pdf
    • https://pazisurezufil.weebly.com/uploads/1/3/4/5/134594691/tazavifidoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lorifawuvawot/20396650071.pdf
    • https://uploads.strikinglycdn.com/files/7ee59e66-925b-4994-a94e-9c3f916f8652/words_their_way_spelling_inventory_primary.pdf
    • https://uploads.strikinglycdn.com/files/a4b17e03-4b81-404e-b48f-fe3c47e9b976/66762144206.pdf
    • https://s3.amazonaws.com/bepukuba/82764603993.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_off0001093b.bin
0e96bffeb843ebbb2f9c445467abb0c37a1454e35c92e2f05ee60dc9ae1a600f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 5304 bytes
font_01_sfnt_off00011b41.bin
32371b3cdcb15b67364b6759b9760917e72e10db50d9c90c42f3322f5e974886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 10772 bytes
font_02_sfnt_off0001400f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1400F 4324 bytes

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