Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6d4dc4f64750f5…

MALICIOUS

PDF

76.4 KB Created: 2021-03-19 13:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f58f3b672c17207587731baa5adbdf0 SHA-1: 9b90ce6e7bbcd1e7d0985fe6e1486be1fe15ff24 SHA-256: 4b6d4dc4f64750f501d14d8c2e971b36ce84214e513c3a73531a97ad37f92491
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 high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm designed to direct users to potentially harmful websites. The document body, though heavily obfuscated, contains a search query related to turning off a Comcast box, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=how+to+turn+off+comcast+box+with+remote
    • https://waxaveroguwako.weebly.com/uploads/1/3/5/3/135344917/fazuzure-ratezex-nulek.pdf
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/mirisedoxis.pdf
    • http://jaxagogilexet.sportsontheweb.net/xetuxakemofi.pdf
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/fujurakumuxutix-junip-tomelowovimede.pdf
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/kimekotogid.pdf
    • https://runigofotizete.weebly.com/uploads/1/3/4/4/134433234/9396258.pdf
    • https://gomepenet.weebly.com/uploads/1/3/0/8/130874128/dd19f074637f3.pdf
    • http://tigadugutuvatix.mygamesonline.org/bedimoxukofelidumibabuf.pdf
    • http://worldworkbook.com/pepolerabiwafuzgknw8.pdf
    • http://fishing-rods2.club/alien_shooter_game_apktydzs.pdf
    • https://devigafaviv.weebly.com/uploads/1/3/4/6/134698058/7ca6aa43c3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/cb043ab5-e659-4485-89ae-6f0c77935035/suwumupudowapuboxavadep.pdf
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_74cf2f82d54b415799f1154ee30157e4.pdf?index=true
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_d655d7844080423297ec36b42bb3c688.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e64264a5-0010-45f6-a1c9-c76af401537a/780248311.pdf
    • http://kivozusemu.atwebpages.com/insinkerator_hot_water_dispenser_faucet_only.pdf
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_d74965d9e37a4546b3a1fd638fde1ff6.pdf?index=true
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_dc41d6f0bc1546068723ec0eaa2dc1d8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd6.bin
7dde71331ac61b5c8d541ab51fccc5cb2985ca0d20af01e675cfa00e905e47e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 5232 bytes
font_01_sfnt_off0000f187.bin
e0f7a48c97c146ae373335404361e32946ee845652ac97adb630d5233b22bc7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 10796 bytes
font_02_sfnt_off0001163f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 4324 bytes

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