Malicious PDF — malware analysis report

Static analysis result for SHA-256 850e7f1b789f6df9…

MALICIOUS

PDF

40.2 KB Created: 2020-04-05 07:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 08b0e82f8ab02b07d0bbccba0b6db7a4 SHA-1: 0e34c3b070b3af24e2f653dcf2fe12f5be6daf9e SHA-256: 850e7f1b789f6df9eaa1bdb9c2ea164cc4c1536e0ffb81a3296671d2ae24d72e
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains. This technique is often used for SEO poisoning to drive traffic to malicious sites or to distribute malware. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted, but the sheer volume of external links suggests a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://3mrobn7zm.com/uploads/1/3/0/7/130776810/130776810.html#skystar+usb+hd+-+dvb-s
    • http://fruitymuncher.com/uploads/1/3/0/3/130323139/633bcc9d4.pdf
    • http://host122.mercyhs.org/uploads/1/3/0/6/130621780/0d38cada.pdf
    • http://kansascitydjservices.com/uploads/1/3/0/5/130589283/jobedozowo.pdf
    • http://manorbedandbreakfast.com/uploads/1/3/0/8/130874679/vezewuzujorosipikav.pdf
    • http://transatlanticsociety.com/uploads/1/3/0/2/130291971/jogitogalavezoj.pdf
    • http://sentientmind.org/uploads/1/3/0/3/130379151/xebore.pdf
    • http://cerebroazul.com/uploads/1/3/1/4/131438888/penidapuxirup.pdf
    • http://dollstaryoga.com/uploads/1/3/0/5/130539108/kobajajujivi-wepigososo-josixalu.pdf
    • http://refineryclocks.com/uploads/1/3/0/7/130776460/tunosan_lavebabali_fepirejugudat_wanozifoge.pdf
    • http://sabahhomestaykualapenyu.com/uploads/1/3/1/4/131453855/jipisabi.pdf
    • http://mandicroft.com/uploads/1/3/0/5/130590666/5812539.pdf
    • http://aaresedu.com/uploads/1/3/0/2/130270895/rovumotaje.pdf
    • http://nativeuniques.com/uploads/1/3/0/4/130435844/mibunixedevobe.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073cc.bin
9911c37a272b3511caed78978e6b5edd783ff8708b7d1e914f6c80a3e4668614		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CC 8312 bytes

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