Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acd6404be21d071…

MALICIOUS

PDF

33.0 KB Created: 2020-04-04 14:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 51e82be75b434b2ea46d164a3026bde6 SHA-1: 81fb0ccac9f116a8d40d4dde8a796e2bac11b4d5 SHA-256: 5acd6404be21d0715ecdcfabf0c367a5592bf41977e7d5e1ff3ee04466ae2c7e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are structured as SEO-optimized links to other PDFs, suggesting a link farm or spamming operation. The document body, though heavily obfuscated, contains references to 'wood heater parts melbourne' and the wkhtmltopdf application, indicating a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://blueaglecaptain.com/uploads/1/3/0/5/130547969/130547969.html#wood+heater+parts+melbourne
    • http://andrewgordonburgers.com/uploads/1/3/0/6/130604791/nomazexipenanifiguzo.pdf
    • http://choose-yourpath.ca/uploads/1/3/0/8/130874529/lurigomakuponad-rukawanupi.pdf
    • http://simienteconsultores.com/uploads/1/3/0/5/130588603/4385345.pdf
    • http://allbyg.com/uploads/1/3/0/4/130476516/9820104.pdf
    • http://swanpump.com/uploads/1/3/0/8/130813577/3439131.pdf
    • http://sealsavvy.com/uploads/1/3/0/7/130776385/1051383.pdf
    • http://charmincarmen.com/uploads/1/3/0/5/130588222/repador-senarezami-rafakakusatafex.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_off00005983.bin
256f08561bcdde78fea33995fd93dc4e5dab171cc25e689af81c44cab8ac8d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5983 7820 bytes

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