Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df17e4115c73a56…

MALICIOUS

PDF

83.4 KB Created: 2021-03-25 05:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34603ceb011bedd98c9b5658a1a81eed SHA-1: d15a27c21aa6f7d031a698ef7a8df344a154a50d SHA-256: 5df17e4115c73a5670586b9002be049f019bea5a827044cb2fb084f30fb3f215
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or direct users to malicious sites. One such link is to 'https://jumiwimov.ru/strik'. No scripts were extracted from this sample.

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://jumiwimov.ru/strik?utm_term=how+to+set+defiant+light+timer
    • http://tazasimeli.22web.org/94236738620.pdf
    • https://cdn-cms.f-static.net/uploads/4383450/normal_6015de0853c28.pdf
    • https://cdn-cms.f-static.net/uploads/4382793/normal_6012925e92108.pdf
    • http://xifizajutebov.22web.org/lagemure.pdf
    • http://bumegafonuvitop.22web.org/85856727419.pdf
    • https://cdn-cms.f-static.net/uploads/4403807/normal_6014bd7a4f450.pdf
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5fc995e422090.pdf
    • https://cdn-cms.f-static.net/uploads/4486965/normal_603a7210dd003.pdf
    • http://gumovuf.22web.org/dead_poets_society_summary.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://turavewolap.rf.gd/waterpik_whitening_water_flosser_refill_tablets_wt-30_uk.pdf
    • http://ranojulugonisa.rf.gd/69465984943.pdf
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_7df91821449244e5a51ec2a905997ad3.pdf?index=true
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_719525b9366049b892e33d453954e20d.pdf?index=true
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_62f6687a04194b64bcd04d783fec3d3a.pdf?index=true
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_c20cc2f2648346dca10c11407dcf76ef.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_2635b96ca8d14e30b6c8824386b3b887.pdf?index=true
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_a9acf30d6a9f4e79937a39faa7ac98d7.pdf?index=true
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_e6ec580125c84f0dae4ac7e620dee443.pdf?index=true
    • http://dibadedogiw.epizy.com/changey_din_kambi_full_video_song.pdf
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_b922589827d443f28e789306aa81ddb0.pdf?index=true
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_dd77e3dadac343d8abfebc2f0a672f9f.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_off00010764.bin
7769b1fa48c9b5dd202490d9e7f34dc74ceaa66e66dcbed7a07205d3e8b1fb5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 5376 bytes
font_01_sfnt_off0001198d.bin
3f968e80584550fc997eb32de183951267db6942b72a43ab93ee7288cd909319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 11384 bytes

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