Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b00edc92a150a4…

MALICIOUS

PDF

46.2 KB Created: 2020-04-21 07:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d034b2bd41ec8ffcecb10b96c486cf06 SHA-1: 2b3d624a86f02fc9eda95374d1789ff8a2443216 SHA-256: b5b00edc92a150a44405175256d7e9896265cca15968f394df9d6b07143686a3
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, indicating a link farm or SEO spam operation. The document body, though malformed, suggests a lure related to 'answer key' content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme.

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://climatechangeforteachers.org/uploads/1/3/0/6/130621912/130621912.html#biconditional+statements+and+definitions+answer+key
    • http://loriclarkeinsurance.com/uploads/1/3/1/1/131164204/4305005.pdf
    • http://brahmaathletics.com/uploads/1/3/0/6/130621285/8447548.pdf
    • http://thenotarytech.com/uploads/1/3/0/7/130738831/381cca98e9.pdf
    • http://myjourneyracing.com/uploads/1/3/0/7/130738748/mekal.pdf
    • http://metuljcki.com/uploads/1/3/1/3/131382486/3ebcd9ea.pdf
    • http://dublinratrace.com/uploads/1/3/0/3/130379239/5928502.pdf
    • http://dondocamoleka.com/uploads/1/3/0/7/130739169/diwajesaz.pdf
    • http://ppsvision.com/uploads/1/3/0/2/130288626/kilududimur_fidegut_refupipideb.pdf
    • http://getarmodafinil.com/uploads/1/3/1/4/131436972/a561b093b546.pdf
    • http://expatchronicals.com/uploads/1/3/0/7/130740010/pevokibexoxudisurege.pdf
    • http://tamarasegal.net/uploads/1/3/0/5/130550787/91628f68.pdf
    • http://seatspritz.com/uploads/1/3/0/4/130483202/9041.pdf
    • http://fernnaturals.com/uploads/1/3/1/4/131453723/ditibo.pdf
    • http://simplygoodburgers.com/uploads/1/3/0/4/130478709/rukepam.pdf
    • http://floodinsurance123.com/uploads/1/3/0/8/130814187/rowokimemodob.pdf
    • http://tamarasegal.net/uploads/1/3/0/5/
    • 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_off0000757f.bin
a6eae47b62a916ad57321560a768e59f087ada71f15b0d23690d5c709f8e2db3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757F 8196 bytes
font_01_sfnt_off000094fe.bin
eb3eb75404dce3ff5138856fdb64036719bdd557a5f8c062583c2614eddde746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94FE 16072 bytes

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