Malicious PDF — malware analysis report

Static analysis result for SHA-256 7723bd8106658d80…

MALICIOUS

PDF

50.4 KB Created: 2020-03-09 08:13:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d6c29561da890875450748e8a2145017 SHA-1: 87de23b7474a7cfc19805c63d7c9d50e172d90a3 SHA-256: 7723bd8106658d80c07c3a01da9a115a6f66d7062d017946c8f94738fce04a53
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric slugs, indicative of a link farm designed to host malicious content. The document body, though partially corrupted, includes a URL that appears to be a lure for a PDF document, suggesting the primary purpose is to redirect users to potentially malicious content hosted on these numerous domains. The ML classifier strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adsl-63-204-18-1.benefitplans.org/uploads/1/3/0/5/130590564/130590564.html#pearson+verbal+ability+and+reading+comprehension+pdf
    • http://howmuchtrip.com/uploads/1/3/0/6/130604606/6170789.pdf
    • http://ampersandcurated.com/uploads/1/3/0/5/130551160/421a0064d14.pdf
    • http://www.hannasuvanto.co.uk/uploads/1/3/0/6/130620511/d292b8e2b.pdf
    • http://www.rivercountryadventours.com.au/uploads/1/3/0/8/130815080/latamafowow-fubirarer-lonifepud.pdf
    • http://alinazhukovskaya.com/uploads/1/3/0/5/130542781/7106390.pdf
    • http://luxurybodysaltz.ca/uploads/1/3/0/8/130874533/bf6d5.pdf
    • http://invivonetwork.com/uploads/1/3/0/7/130776229/766f45e.pdf
    • http://www.3kingscustomhomes.com/uploads/1/3/0/2/130272548/bajovemonijusoto.pdf
    • http://jacksonvilleportparking.com/uploads/1/3/0/5/130551143/raxuz.pdf
    • http://evolutionarystrength.fit/uploads/1/3/0/7/130739368/divoxakaxanopowu.pdf
    • http://www.ponoshellcreationshi.com/uploads/1/3/0/9/130969053/c9ea173e3c.pdf
    • http://www.source1partners.com/uploads/1/3/0/8/130873786/2264416.pdf
    • http://trackyourcalls.com/uploads/1/3/0/3/130379462/1626ef547.pdf
    • http://anusaf.com/uploads/1/3/0/7/130739405/8375621.pdf
    • http://poshhaircollc.com/uploads/1/3/0/9/130969953/nudalelupe.pdf
    • http://lightingdesignlab.net/uploads/1/3/0/6/130621947/523384.pdf
    • http://drivinglessonsglastonbury.com/uploads/1/3/0/6/130604473/revuv.pdf
    • http://mysamcooke.com/uploads/1/3/0/6/130621775/0e6555.pdf
    • http://davidbarthwell.com/uploads/1/3/0/8/130873864/8390240.pdf
    • http://hostmaster.theatricks.org/uploads/1/3/0/2/130274304/f9762.pdf
    • http://folkesworton.com/uploads/1/3/0/4/130477448/taxabogo.pdf
    • http://mycleanohio.com/uploads/1/3/0/7/130740392/9553912.pdf
    • http://bestgeekdeals.com/uploads/1/3/0/7/130776079/sogaluvi.pdf
    • http://www.samerjanforpresident.com/uploads/1/3/0/4/130488091/5276138.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000868e.bin
6c4bb8b83c176bcb5dd600d36d51ddc977ab94705e3427d08a1b62856b954360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x868E 8164 bytes
font_01_sfnt_off0000a608.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA608 16036 bytes

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