Malicious PDF — malware analysis report

Static analysis result for SHA-256 35485dd9a81999d3…

MALICIOUS

PDF

37.8 KB Created: 2020-04-14 15:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 37d61262835c8648767ce70b7ff63551 SHA-1: d22758e648fea6369f885d7194b86a770bce6b1c SHA-256: 35485dd9a81999d312f2be0c4611c5ef49e59bacb3930eb753b6328a2458fe35
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to domains that appear to be part of a link farm designed for SEO manipulation. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. The document body, though heavily obfuscated, contains text related to 'Academic information system open source' and references wkhtmltopdf, suggesting a lure to disguise the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://michealsdeckrepair.com/uploads/1/3/1/4/131407807/131407807.html#academic+information+system+open+source
    • http://tiffmakeup.com/uploads/1/3/0/5/130541351/nibijojit.pdf
    • http://toya.shop/uploads/1/3/0/4/130488987/4502555.pdf
    • http://mententertainment.com/uploads/1/3/1/4/131453010/mupigudage.pdf
    • http://southforkranchks.com/uploads/1/3/0/8/130874305/fibosujatoxuti.pdf
    • http://ff-miami.com/uploads/1/3/0/6/130604078/6287642.pdf
    • http://plantingseedsforlife.com/uploads/1/3/0/3/130379445/a114fd3c7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062b2.bin
a69c520ab2237a17fdd25151f25b00beb6eba6f2da94f5673570b9853c8c49cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B2 7504 bytes
font_01_sfnt_off0000802a.bin
83d89f79375f7f339e88070a8779324ce221c94923bff415e388e162fbc46cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802A 2604 bytes

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