Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3aeac145659a7e…

MALICIOUS

PDF

42.8 KB Created: 2020-04-09 14:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e030b216f61c524bbd6a46cc3d96e383 SHA-1: 91539500992adc4bc7b3150697006e8e79a1028e SHA-256: 7d3aeac145659a7e34e46dbe5fd0c87eb0f49eca8ffedfc29820ad9706d6271d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a dropper. The document body, though obfuscated, contains URLs that align with the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.Dropper.Agent-8799715-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8799715-0
  • 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 http://colddiamnd.com/uploads/1/3/0/5/130589427/130589427.html#realidades+1+capitulo+1a+practice+workbook+answer+key
    • http://anglersbarandgrill.net/uploads/1/3/0/7/130775432/8844540.pdf
    • http://sara-purcell-technical-coach.com/uploads/1/3/0/6/130639183/jokatosovemef-fuzokagevus-daseduxobij-xonazibepid.pdf
    • http://cflucktraining.com/uploads/1/3/0/7/130775357/89958dc793f.pdf
    • http://virginiariverfestival.com/uploads/1/3/0/2/130288455/jivajuzog.pdf
    • http://pacdrygoods.com/uploads/1/3/0/8/130874241/tuzezuxurofepe-baripivelezom-zusumepinaf.pdf
    • http://nymica.com/uploads/1/3/0/6/130604108/dosoxetinozirukude.pdf
    • http://davidbethke.com/uploads/1/3/1/3/131379776/e763eed818.pdf
    • http://neblesslings.com/uploads/1/3/0/2/130289711/jewaxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007303.bin
cc6155f33d0c8fd4aaa88efa74ed741f23bd0243839606532f1b0afcb225801d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7303 8896 bytes
font_01_sfnt_off00009497.bin
1b3f82cd74c5b6671cc0c0d4a6c7877b74bb57ca469b2a61ef541918e41af838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9497 2652 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.