Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdb4f197eb55aa0…

MALICIOUS

PDF

83.8 KB Created: 2021-04-24 19:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 185a629b57153804df35b88afa7defd8 SHA-1: 7caeb91efee8b87c65615d94a4b7d45c9c3b2f46 SHA-256: 8fdb4f197eb55aa00f53cc8e00120501b96f4fd39ff3739a91087f30822fd000
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 appear to be part of a link farm designed to improve search engine rankings. One prominent URL, 'https://maypoin.ru/strik?utm_term=white+christmas+tree+with+blue+lights+ideas', suggests a lure related to search queries. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/strik?utm_term=white+christmas+tree+with+blue+lights+ideas
    • https://cdn-cms.f-static.net/uploads/4419851/normal_6059b82deeb99.pdf
    • https://cdn.sqhk.co/vorebilifi/eidSdaG/polar_explorer_roller_coaster.pdf
    • http://xemopubuga.iblogger.org/mendelian_genetics_worksheet_1_answers.pdf
    • https://cdn.sqhk.co/libobivole/ejfidih/the_game_of_life_online_cellular_automata.pdf
    • http://lexamopelezun.mywebcommunity.org/77742007449.pdf
    • https://cdn-cms.f-static.net/uploads/4367674/normal_602042e8392e8.pdf
    • https://static.s123-cdn-static.com/uploads/4491946/normal_5fcd55d354a32.pdf
    • https://cdn.sqhk.co/sunomedude/bPycPYJ/block_puzzle_new_1010_king.pdf
    • https://cdn.sqhk.co/kapapomabu/iqidijv/delusions_and_other_irrational_beliefs.pdf
    • https://cdn.sqhk.co/wakewafo/gdjfgcX/fosexinogisusilisuri.pdf
    • https://cdn-cms.f-static.net/uploads/4379736/normal_602970055f212.pdf
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdf
    • http://vesajob.getenjoyment.net/pafitew.pdf
    • https://cdn.sqhk.co/poxirowo/gigfgd1/shooter_jennings_kids.pdf
    • https://cdn.sqhk.co/bolukawet/bijoEC9/toon_blast_hack_android_2019.pdf
    • http://vudujupuboneg.22web.org/jirer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vejojivusuze.rf.gd/arqueologia_del_saber.pdf
    • http://divapikej.rf.gd/john_deere_310_backhoe_hydraulic_problems.pdf
    • http://kuxemozoxabonag.onlinewebshop.net/zidaxegirawuwinisaxa.pdf
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_c842720fa780430eb1c33371d9ae9385.pdf?index=true
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_b8e22f84d7644ca8b71910ee3ee33d1c.pdf?index=true
    • https://ce722411-b424-48ee-ac00-b4ed8818edd9.filesusr.com/ugd/bff0de_68a26939211a4388801c993b8852a8ae.pdf?index=true
    • http://defozuwonig.rf.gd/living_by_the_book_workbook_answers.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_off0000fba4.bin
6a9823dae16ae278866a72374a82a3f3e6b5a2f4197511dadb49348e1403c86a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 5264 bytes
font_01_sfnt_off00010d99.bin
f720d102714b00383999c33a6d017eca269c2302076a2e600310aa1c73aab4b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 11124 bytes
font_02_sfnt_off0001339c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1339C 4324 bytes

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