Malicious PDF — malware analysis report

Static analysis result for SHA-256 726bf2ed6259590b…

MALICIOUS

PDF

91.5 KB Created: 2021-02-17 14:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 69e9ff2fb19152a273701b095259c7b0 SHA-1: 61bfd03bef9b63b9b773ba8746ecd8c1d0a76217 SHA-256: 726bf2ed6259590b655a7380c1ddebb74d7300e3f34c86f645eb25730aa0315c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. One of the extracted URLs is `https://leonvi.ru/wix?keyword=where+to+get+spark+energy+drink`, which appears to be a search query. The PDF structure and the presence of numerous external links point towards an attempt to manipulate search engine rankings or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leonvi.ru/wix?keyword=where+to+get+spark+energy+drink PDF link annotation
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/vamisuxuvurak-nagadowax-juzabe.pdfIn PDF document text
    • https://wikifepum.weebly.com/uploads/1/3/3/9/133986434/1899118.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/lovuxejuwibazuginil.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/ripekekafo.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/jg0kpwK/sony_rewards_points_not_updating.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/6hfWO4Y/18947899224.pdfIn PDF document text
    • https://cdn.sqhk.co/kokijunuxagi/gNzT6gf/best_january_2020_tv_shows.pdfIn PDF document text
    • https://dinadexoliba.weebly.com/uploads/1/3/6/0/136091941/kezapoxe.pdfIn PDF document text
    • https://jezaxinadi.weebly.com/uploads/1/3/4/5/134597346/599a98da.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/jbAgdzL/jufavimivoxeriguzaveworif.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/7150102.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/icWjfjc/98775507064.pdfIn PDF document text
    • https://cdn.sqhk.co/nosisatoved/gchgghd/photoshop_animation_bouncing_ball_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sizabo/burnout_3_para_pc_completo_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/assassin_s_creed_apk_obb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 5156 bytes
SHA-256: 4021acd2792de4e7867364372c0f82b0972cf08acaf945f872961b33214d3f27
font_01_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 11132 bytes
SHA-256: d3325b7278fb71dae06105eb20c607201bf9900ed88a6f651da34116c70d2dff
font_02_sfnt_off0001528a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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