Malicious PDF — malware analysis report

Static analysis result for SHA-256 f649eb22a84e6f6d…

MALICIOUS

PDF

77.3 KB Created: 2021-05-03 02:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb12c90ddefc92e50e96100c536d3c09 SHA-1: 769aed09d20869d7dee0f43a7f606e6484c7e4a1 SHA-256: f649eb22a84e6f6d1ee61a7dd4867e4c55166106e2d36eba626fd87783f75df9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links, including one to a known malicious redirector, suggests an attempt to lure users to malicious sites or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/strik?utm_term=get+tough+laws
    • https://cdn-cms.f-static.net/uploads/4456372/normal_6065de1a9382f.pdf
    • http://lenudes.com/bufosizomiberekaxtuka.pdf
    • https://cdn-cms.f-static.net/uploads/4394060/normal_601aa7ffb16a7.pdf
    • http://barashik.space/open_video_photormi75.pdf
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/9876667.pdf
    • https://static.s123-cdn-static.com/uploads/4420432/normal_5fde3f418a158.pdf
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/8414756.pdf
    • https://static.s123-cdn-static.com/uploads/4412890/normal_5fdf8c5ec72a0.pdf
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6027cbda2f538.pdf
    • https://donimafu.weebly.com/uploads/1/3/5/3/135395233/6436648.pdf
    • https://static.s123-cdn-static.com/uploads/4427544/normal_5fcd50d759a49.pdf
    • https://tidatulo.weebly.com/uploads/1/3/2/8/132815220/4234232.pdf
    • https://cdn-cms.f-static.net/uploads/4464532/normal_60258bfea3906.pdf
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fc938c09912a.pdf
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/caeaa9118.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8dbe9322-e565-4ae2-8edc-f913bdc72877/dunkin_donuts_gift_card_offer.pdf
    • https://uploads.strikinglycdn.com/files/33a6c25b-b634-4bd0-9f0e-11c3580db3f6/9488372836.pdf
    • https://uploads.strikinglycdn.com/files/d0921278-d269-45cd-a812-7e093bbca3c6/how_to_read_a_lowrance_hook_3x_fish_finder.pdf
    • https://uploads.strikinglycdn.com/files/9e517a02-5986-4dce-8250-9bfea0b6059f/bissell_power_steamer_duo_pads_2078k.pdf
    • https://uploads.strikinglycdn.com/files/33f9b0a3-2bab-48bb-b8ad-fe8a6a03c213/miwafejalu.pdf
    • https://uploads.strikinglycdn.com/files/eb15b16f-11b7-4e8f-869b-2455bf194301/legazufupoduwirelajofugu.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_off0000f14a.bin
1a5c6c8baca4c90f34d2057c8160d303d7a1e6bfa1bf8270b713d7efc46ade4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 4976 bytes
font_01_sfnt_off0001024b.bin
4faf489b7f38df2bb5b2ab405884a00a2d5470e5f0b7feaade71d98c8cf88099		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 10796 bytes

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