Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bac8a199afcfa55…

MALICIOUS

PDF

85.5 KB Created: 2021-03-06 08:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 037b6eba84fedb8740491ac350774de8 SHA-1: d421318a0584aa388bd06008f402df3c51a49577 SHA-256: 4bac8a199afcfa5571591469cb5e83583932a9f16509f473a9535b1718aa5bbb
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to multiple PDFs. The embedded URLs suggest a tactic to drive traffic to various external sites, potentially for SEO manipulation or phishing, rather than direct exploitation.

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://jacksth.ru/award?keyword=how+much+is+a+brand+new+samsung+s9
    • http://godubumoze.iblogger.org/texas_holdem_poker_guide.pdf
    • https://cdn.sqhk.co/vilomikov/pjajggc/90466413729.pdf
    • https://zagozejidenadap.weebly.com/uploads/1/3/1/4/131407028/xuginidivododurijum.pdf
    • https://cdn.sqhk.co/busoleva/hfiePgf/rubber_chicken_cards_login.pdf
    • https://cdn.sqhk.co/fisejadiruw/dnjdQG8/18768571723.pdf
    • https://kaxejawajafu.weebly.com/uploads/1/3/4/7/134776484/8888649.pdf
    • https://cdn.sqhk.co/malevevipali/Ojhje5V/download_game_maker_studio_1_full_crack.pdf
    • http://faxadiweruxu.22web.org/vorabikusobigif.pdf
    • https://cdn.sqhk.co/litigoruf/efBhalm/buy_on_ebay_with_visa_gift_cards.pdf
    • https://cdn.sqhk.co/bijowiroma/gif0gfo/34992824779.pdf
    • https://cdn.sqhk.co/jilowepe/XZRihjj/95414183787.pdf
    • https://cdn.sqhk.co/woberimi/haNyggx/xalizubo.pdf
    • https://lunisaga.weebly.com/uploads/1/3/5/3/135302545/b98c97b0.pdf
    • https://cdn.sqhk.co/suwuwewazaka/f1ggYih/95860748801.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/9b34e3bf-e7c3-4dcc-958e-ac414a6704b2/beats_studio_3_wireless_camouflage.pdf
    • https://uploads.strikinglycdn.com/files/1476bd4c-63b7-4890-ba79-085cdce24f80/mini_displayport_to_vga_hdmi_dvi.pdf
    • http://kulixuvomewono.epizy.com/kidde_nighthawk_ac_plug-in_carbon_monoxide_alarm_manual.pdf
    • https://uploads.strikinglycdn.com/files/dcebff60-c9f7-44f9-8370-f493bb7a9a3b/kavix.pdf
    • https://uploads.strikinglycdn.com/files/9f4fd0bf-321d-46c2-a26a-9f6a6b55a80e/femafulovosilab.pdf
    • https://uploads.strikinglycdn.com/files/a7ca7afc-147a-42a6-8c69-4e5ebceb6e69/39977067831.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_off000104f5.bin
70466059f9c5021c6626de54520ca931159fa65639fbc46248338bf3d04b2509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 5472 bytes
font_01_sfnt_off00011764.bin
6ee469591eddc5993fff3709037966eacb68ca93fd57becd52a813b98ee78285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 10324 bytes
font_02_sfnt_off00013ab8.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB8 4324 bytes

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