Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7eff0c25feab1f5…

MALICIOUS

PDF

76.7 KB Created: 2021-03-04 17:15:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96525a31b81f074f6bb71c96622376cb SHA-1: ea02306d8f2e0d6ac64a68605bb3763b3c2e3df8 SHA-256: d7eff0c25feab1f509a5bc56cbe805bce8116c5171f699e9ef253dd1062c8ba3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm or SEO spam, designed to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to exploit users by redirecting them to potentially harmful content.

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://leonvi.ru/wix?keyword=ap+chemistry+multiple+choice+2016+pdf
    • http://idealicaitalia.website/63464573994uij8i.pdf
    • http://universal-kirov.ru/4966955035cyquw.pdf
    • https://fanesorugetefex.weebly.com/uploads/1/3/1/3/131383934/pabojivafo-murajabavodise-tixopixozawola.pdf
    • http://avtoshkola-region26.ru/xc_mountain_bike_racing_tipstadrv.pdf
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/bidebejunok.pdf
    • http://rineset.xyz/683509848538rwig.pdf
    • http://lestyprin.online/lagu_terdiam_dalam_sepi_remix0wv9v.pdf
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/wagapabeti.pdf
    • http://hotloveme.online/wisoxikayp43.pdf
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/gagapo_dakodefipemavu.pdf
    • http://reduslim-official.website/834063380374jzt5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_7047ee5333cb4acebe4d1731b1ade755.pdf?index=true
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_0d6eaf7a2fbb4984ad643e9ec1193099.pdf?index=true
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_b39d655ae98d4bf9a77f10d1e3c631ab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8accd114-0e98-4689-a3b8-f5fe446e55ab/what_states_dont_require_helmets_for_motorcycles.pdf
    • https://uploads.strikinglycdn.com/files/dc957ed5-e454-4f91-8431-1c8eb38506a8/sears_craftsman_snow_blower_manuals.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed81.bin
5b74a445bb903b4cc79591f00985b24f8440ba65e8c0c8e5aa830f93e9eb350c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 5756 bytes
font_01_sfnt_off0001010c.bin
400bbf6116e9239c3a30b03eb4986a49b1918c83fef548a117afb9e2d8a57577		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 11384 bytes

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