Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60b9f1f668fe35d…

MALICIOUS

PDF

52.4 KB Created: 2020-04-09 10:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 194e4001f986b4a04ae303f11e1eb6f2 SHA-1: 7f37c10c4b7ed0ac5846661d44c3bc86dc415912 SHA-256: e60b9f1f668fe35d0b888cf32d4531cbfe67984f34413109fb5e5c228475c01b
94 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to PDF files with numeric or generic slugs on various domains, suggesting a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains references to medical terms and the authoring application, which are likely used to disguise the malicious intent. The primary goal appears to be directing users to a network of suspicious websites.

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://redskitchentavern.com/uploads/1/3/0/6/130604273/130604273.html#icd+10+for+urinary+pressure
    • http://thedips.store/uploads/1/3/0/7/130776381/tezab.pdf
    • http://maggieshousevalues.com/uploads/1/3/1/4/131437849/darulemepowu_nitojedowolilu.pdf
    • http://tasmichos.com/uploads/1/3/1/1/131164485/fixedawukegiwizuv.pdf
    • http://fedelsborg.dk/uploads/1/3/1/0/131070605/309f3294b1466.pdf
    • http://infocusgt.com/uploads/1/3/0/4/130478244/ebcb9a0e01257.pdf
    • http://worldmaco.com/uploads/1/3/0/2/130271132/d41217.pdf
    • http://accladding.com/uploads/1/3/0/6/130603696/62538de7722c92.pdf
    • http://fibroblastbyrenaissance.com/uploads/1/3/0/4/130483983/malezuri-dunediw-sizujomanupoza-vozojadu.pdf
    • http://everyoccasionartistry.com/uploads/1/3/0/8/130814992/2484418.pdf
    • http://14weekends.com/uploads/1/3/0/5/130547969/07a01.pdf
    • http://es20a.com/uploads/1/3/0/7/130776070/8687600.pdf
    • http://jarrinsolomon.com/uploads/1/3/0/5/130551957/navojisomujezeted.pdf
    • http://pof-customercare.com/uploads/1/3/0/3/130313590/016ffaf62fa70.pdf
    • http://jak-sie-rozwiesc.com/uploads/1/3/0/9/130969384/9176691.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_off00008dbc.bin
0705b15752c8df5ef25a0703d5265027365b2e6e7cecff54aecc26f4db44f25a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBC 8388 bytes
font_01_sfnt_off0000ae0f.bin
ddc6c38a5929b263b215a5b0c7aa8b1a409f146866f06980111f9f21a6232bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0F 16036 bytes

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