Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83a318ecb45f121…

MALICIOUS

PDF

72.3 KB Created: 2021-05-17 04:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7ebbd86fc896ee4194fe9ce0305c8820 SHA-1: 89523552c8f6c7f370e9e329ba5f97b094da38f0 SHA-256: d83a318ecb45f121822adc70819da4a098a63fe7fb1dceddc3d1bc76ec7e8c2a
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains a title related to 'how to light switch timers work' which is likely a pretext to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=how+to+light+switch+timers+work PDF link annotation
    • http://nojigopagapusu.mygamesonline.org/south_africa_tourist_map.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/ehhggeb/35575392320.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/char_broil_performance_4_burner_gas_grill_replacement_parts.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/53225283179.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/ghLfEhf/age_of_empires_2_conquest_indir.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/cctv_camera_troubleshooting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_6889ebeb08014bb8834674645183a917.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_5af8df4f762343818670419470e71b73.pdf?index=trueIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/grants_atlas_of_anatomy.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_2545682b126c4c1a82e35244a154e378.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_e57806dc805d41c0a69f0d087040ef1b.pdf?index=trueIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/rilimubevo.pdfIn PDF document text
    • https://b27aca93-056c-4dd2-83a6-fd909c9f709d.filesusr.com/ugd/2ba3ac_6cded0884e4b413ba962cb7a8d1d7357.pdf?index=trueIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_0cce4c7e487d4290a79fd7b47343c0d1.pdf?index=trueIn PDF document text
    • http://gegurobaz.myartsonline.com/83704477979.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_6aceaae710d04851bceb9b13de3c162b.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_56f5484f8c9a4948b6685d2ee13c3514.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajixe/zizovoperulasejarivib.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/91245423999.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 5120 bytes
SHA-256: 7baf79393c4ecefe3c9a624509b4bbada3ccf0a35937a987c6cece664cfb5ec6
font_01_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 10220 bytes
SHA-256: e82d92456614d3abaf402cc044a91770ed6fc429fdb11d6cd7b41744d6b8f575