Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a98fcbd238a2c5…

MALICIOUS

PDF

32.4 KB Created: 2020-04-05 08:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb1cf05431f4725b1c7fded6c218efab SHA-1: b6d97a6a8190c4f2577b1a1d46f7c9aef44577a3 SHA-256: a0a98fcbd238a2c5bec2ef258a405db58257f476e08f33c04df6afb99512b8d8
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains text related to 'Fundamentals of electric circuits solutions manual 6th edition', which is likely a lure to encourage users to click on the embedded malicious URLs. The ML classifier strongly indicated maliciousness.

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://makeupandexhale.com/uploads/1/3/0/7/130739746/130739746.html#fundamentals+of+electric+circuits+solutions+manual+6th+edition
    • http://areastrategy.com/uploads/1/3/0/6/130639922/4983780.pdf
    • http://australiafirstsolarenergy.com/uploads/1/3/0/5/130545753/xelopivemu-sosojudinajo-bugetujefe-modikokufik.pdf
    • http://netzwerrk.com/uploads/1/3/0/3/130313624/6178779.pdf
    • http://stokesdalegsm.org/uploads/1/3/0/6/130621359/milikex_xojarot_movik.pdf
    • http://stacysdogtraining.com/uploads/1/3/0/7/130739633/ef6d5.pdf
    • http://tenpointlogistix.com/uploads/1/3/0/8/130874635/gifum_wunojaso_bafazefi_tarilarumi.pdf
    • http://cirujanocardiovascularrd.com/uploads/1/3/0/2/130289696/kixulimolekudu.pdf
    • http://ink8boardtattoo.com/uploads/1/3/0/2/130289564/6391823.pdf
    • http://saisrl.info/uploads/1/3/0/6/130639853/mezarurigibeki_salosamed.pdf
    • http://psicologia-elroble.com/uploads/1/3/0/5/130545194/2410585.pdf
    • http://romanacoutureshop.com/uploads/1/3/1/1/131164485/8427384.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_off00005731.bin
ddb0b4ed86364fee19bad1cc7a4583b790336176a978dcd64ea2433c8c29d7be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5731 7376 bytes

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