Malicious PDF — malware analysis report

Static analysis result for SHA-256 56437e01a35d5d48…

MALICIOUS

PDF

32.6 KB Created: 2020-03-25 01:00:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9c6fa653bc321ebf3c1b3063c40ed61 SHA-1: 9b417efe050f984176a9df5982faf66c6edabccd SHA-256: 56437e01a35d5d48338c724e94687756c7c56b179b5180eff4892fde8b002e27
94 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 are numerically or generically named PDFs hosted on various domains. This pattern is indicative of a link farm or SEO spam operation, likely intended to drive traffic or host malicious content. The document body text, while seemingly innocuous ('cute rabbit drawings'), is used to disguise the malicious intent of linking to numerous external resources.

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://johnsonandsonsservices.com/uploads/1/3/0/4/130493389/130493389.html#dibujos+de+conejos+tiernos+a+color
    • http://lamodmom.com/uploads/1/3/0/6/130604505/veweverus.pdf
    • http://lynchplumbing.net/uploads/1/3/0/4/130488732/fizowirike.pdf
    • http://sunsetplaza.org/uploads/1/3/0/2/130288542/vimuzeda.pdf
    • http://rgremodelingllc.com/uploads/1/3/0/3/130323139/75970.pdf
    • http://tneducatorsconnect.org/uploads/1/3/0/5/130590558/medutosofilal-dusofokafapu-judop.pdf
    • http://www.fahadalotaibi.ga/uploads/1/3/0/8/130874396/8072345.pdf
    • http://leilshishy.com/uploads/1/3/0/7/130776518/075113000d8d86.pdf
    • http://raisethewoofpethotel.info/uploads/1/3/0/8/130814209/lowod.pdf
    • http://grapheinsarl.net/uploads/1/3/0/3/130312913/xumumazudoget.pdf
    • http://mail.monticellosearch.com/uploads/1/3/0/8/130813524/sisezas.pdf
    • http://vogue94.com/uploads/1/3/0/6/130621542/dafutopipawudul.pdf
    • http://www.dtapto.org/uploads/1/3/0/4/130489052/9cecccde3dd0.pdf
    • http://thiagotiveron.com/uploads/1/3/0/5/130550693/9520a850bd9b8.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_off00005981.bin
4de0e7dda3306a73a87d294af08339a8acfb67464f7336092c8e39bdd11362c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5981 7468 bytes

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