Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbff7375f325f61…

MALICIOUS

PDF

72.0 KB Created: 2020-04-02 04:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec1db0b0849a36b645f606d01719a45c SHA-1: 970a555a37136ac5da894a15ac27d8d1b7062ca0 SHA-256: afbff7375f325f61e907add0e0832ae45ff82aca3c5383d14d5710372497100b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. This pattern is indicative of a link farm or SEO spam, potentially used to distribute malicious content or manipulate search engine rankings. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://4gen4.org/uploads/1/3/0/7/130739264/130739264.html#que+es+naturaleza+juridica+concepto
    • http://bcscouriers.com/uploads/1/3/0/6/130621354/goneludizixubow_sepugove_pulonisa.pdf
    • http://avalonbbq.com/uploads/1/3/0/6/130604759/gomizupawa.pdf
    • http://rocketmanentertainment.net/uploads/1/3/0/3/130313046/4877720.pdf
    • http://pipes-underground.com/uploads/1/3/0/9/130969664/nebovulama-xawezepezimez.pdf
    • http://innovateaesthetics.com/uploads/1/3/0/5/130588724/6390611.pdf
    • http://cookingwithpolygons.com/uploads/1/3/1/0/131070329/f4e21e.pdf
    • http://modernpavingsystems.com/uploads/1/3/0/6/130620926/3446046.pdf
    • http://superminigameconsole.com/uploads/1/3/0/8/130873851/c237fdb.pdf
    • http://personaltransformation.ca/uploads/1/3/0/2/130272084/7283714.pdf
    • http://anilmotors.net/uploads/1/3/0/7/130739396/64d6b0.pdf
    • http://ige.education/uploads/1/3/0/7/130739450/973872.pdf
    • http://csoblainville.com/uploads/1/3/1/3/131380347/kidafepopoji_wufugilibevazan.pdf
    • http://essentialoilscyprus.com/uploads/1/3/0/8/130813992/vivupazelozir.pdf
    • http://personalstylistsdenver.com/uploads/1/3/0/4/130476215/nalawetilejerepo.pdf
    • http://lifeoutlines.com/uploads/1/3/0/4/130435573/5d381.pdf
    • http://meatcraftnj.com/uploads/1/3/0/6/130604656/joribi.pdf
    • http://kidseyesfl.com/uploads/1/3/0/7/130739284/9847324.pdf
    • http://myaffiliatepages.org/uploads/1/3/0/8/130814471/duregepaxup-doxole-xigobaxegusojar.pdf
    • http://rowenaelliott.com/uploads/1/3/1/3/131379586/duseworizibi.pdf
    • http://mccaweast.com/uploads/1/3/0/2/130272420/tonalasipepi.pdf
    • http://davidstocum.com/uploads/1/3/0/8/130873918/jirojurazuf.pdf
    • http://moralinjuryhealinginstitute.org/uploads/1/3/0/7/130775653/sifetorojoma-bofeb.pdf
    • http://wainuiponyclub.org/uploads/1/3/0/6/130639471/1570555.pdf
    • http://royleconsulting.com/uploads/1/3/0/5/130590325/9353811.pdf
    • http://hispanocenter.com/uploads/1/3/0/6/130603969/duwetikubapa.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_off0000ecfc.bin
c16b44eaa882a9a2a0712dff3e272a3ff6a266ebe2c6725b99213310e2a7b02b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 10764 bytes

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