Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f39c612f0d6a390…

MALICIOUS

PDF

41.2 KB Created: 2020-04-17 03:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f8cde8c90f3cfe672f332f2acc04fcff SHA-1: 48f902c1f946324905c8552f7bbb3fc0e62d35f2 SHA-256: 3f39c612f0d6a390f7e56b91f86f62579c916d4a606d029333a437e3ebbb226b
94 Risk Score

Malware Insights

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

This PDF document is identified as malicious by an ML classifier and contains a large number of external links, many pointing to other PDFs. The document body, though obfuscated, contains a URL that leads to a page claiming to offer 'Inspirational quotes poster template', which is likely a lure. The primary function appears to be acting as a link farm to distribute other malicious PDFs.

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://untamedbooks.com/uploads/1/3/1/4/131406811/131406811.html#inspirational+quotes+poster+template
    • http://jabspainting.com/uploads/1/3/0/8/130814066/762ec52757f6.pdf
    • http://mathewsengineering.com/uploads/1/3/0/6/130639073/9882582.pdf
    • http://noxonroadpta.com/uploads/1/3/0/7/130775478/defiwajal.pdf
    • http://hypnotheose.com/uploads/1/3/1/4/131454238/bebufini.pdf
    • http://rockoutscholarshipfund.com/uploads/1/3/0/8/130814763/tasifavi.pdf
    • http://partymap.org/uploads/1/3/0/3/130313263/likob-sifelaxoso-daregi-xojorimupama.pdf
    • http://edenwoodranchandpreserve.com/uploads/1/3/0/3/130323161/7582352.pdf
    • http://texereanalytics.com/uploads/1/3/0/6/130639863/zirel.pdf
    • http://incognitam.com/uploads/1/3/0/5/130545194/mujuwatokiwoteditu.pdf
    • http://alwaysondutyhomewatch.com/uploads/1/3/0/6/130604606/21863b2c17.pdf
    • http://preciousdollsragdolls.com/uploads/1/3/1/3/131383602/lelikise.pdf
    • http://totalwebagency.com/uploads/1/3/0/5/130542934/kekomewavumufa-bojirawu-wujadaxukediwe.pdf
    • http://vpmsilverbars.com/uploads/1/3/0/3/130323466/tuvijugikovumewopomu.pdf
    • http://rangoonrubyrestaurant.com/uploads/1/3/0/7/130776640/merororudasixa.pdf
    • http://texereanalytics.com/uploads/1/3/0/6/13
    • 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_off00007bb6.bin
cb1ca07484b1958574c60b820ea16b3aaf80c671ae4c036693e18120a170fb32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB6 7384 bytes

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