Malicious PDF — malware analysis report

Static analysis result for SHA-256 a963a74b79de0290…

MALICIOUS

PDF

51.0 KB Created: 2020-04-13 20:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2898464ffef22dd52fe6ccad34d5319b SHA-1: 712062b69e23225a98568042101fe2c5c948c398 SHA-256: a963a74b79de02900811d1b7869647419888ebd81f574f531d848d3aa205291c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a PDF link farm and ClamAV detection. The document body, though heavily obfuscated, contains references to 'resignation letter sample format in india' and numerous external URLs. These URLs likely serve as lures to download further malicious content, such as other PDFs or executables, as indicated by the PDF_SEO_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.Malware.Agent-9902530-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Malware.Agent-9902530-0
  • 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://ashart.eu/uploads/1/3/0/4/130491008/130491008.html#resignation+letter+sample+format+in+india
    • http://alanhiggison.com/uploads/1/3/0/5/130543600/585ede5054448c.pdf
    • http://grambogames.com/uploads/1/3/0/3/130379370/kafagotijuvu_jidibus_nofuxupabitudil.pdf
    • http://wranglerridgeranch.info/uploads/1/3/0/2/130272548/3734206.pdf
    • http://williamyun.com/uploads/1/3/0/6/130620537/44673698f9bb9.pdf
    • http://fiveminutememories.com/uploads/1/3/0/6/130621223/biwisovif-bilerojubiwe-revitufazijolog-wavetebatezaw.pdf
    • http://portrushheritagegroup.com/uploads/1/3/1/3/131383549/tuzusekopewu-jixijelazovem-fuwezoxawo-xajepapajok.pdf
    • http://insideski.net/uploads/1/3/1/4/131407736/mabebavixupebor.pdf
    • http://batesstoddardrealestate.com/uploads/1/3/0/4/130435966/9463615.pdf
    • http://wmbcreditsolutions.com/uploads/1/3/0/7/130739601/35cf87d0d4.pdf
    • http://iazrya.com/uploads/1/3/0/8/130814241/49e87e67.pdf
    • http://insideski.net/uploads/1/3/1/4/131407736/mabeb
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008865.bin
ab53d8f9da408a7322d79fcc9c0f473f5d1c9f5a84e0c89d7231942789d61ba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8865 9028 bytes
font_01_sfnt_off0000aad1.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD1 16036 bytes

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