Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14990944dc8df9f…

MALICIOUS

PDF

48.2 KB Created: 2020-03-17 19:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce7da6e5ae5d888ec848f5cf8a59f439 SHA-1: 2b80220457403f83f34291741cf5e78a00cce742 SHA-256: b14990944dc8df9f3b58ec160394df50770a6fa81c37b634fc2d6cd6f2e98d75
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The primary URL points to a page with the title 'Abecedario en ingles con imagenes para imprimir letra por letra', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious activity. No scripts were extracted, and the document body primarily contains obfuscated text and URLs.

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://ndtasanantonio.org/uploads/1/3/0/6/130621162/130621162.html#abecedario+en+ingles+con+imagenes+para+imprimir+letra+por+letra
    • http://noroydesign.com/uploads/1/3/0/3/130323290/zosavigunexixag_bukusowonixasu_tediwolinuloz_xidatet.pdf
    • http://cloggingworkshops.info/uploads/1/3/0/3/130323268/5bac5c3817.pdf
    • http://wifeycosmetics.com/uploads/1/3/0/3/130313415/6041537.pdf
    • http://premiumheir.net/uploads/1/3/0/8/130814126/wikipo.pdf
    • http://www.edicionessimiente.com/uploads/1/3/0/6/130639892/9789498.pdf
    • http://besthawaiilandscaping.com/uploads/1/3/0/7/130774994/47632557db2bb.pdf
    • http://nfloo.com/uploads/1/3/0/6/130604887/3705407.pdf
    • http://www.store.generalpencil.com/uploads/1/3/0/5/130546036/tolebimujokazi.pdf
    • http://bloggersforacause.com/uploads/1/3/0/4/130477039/zesetifafidu.pdf
    • http://www.oblates-osb.org/uploads/1/3/0/6/130604269/ratafivizod.pdf
    • http://87solutions.net/uploads/1/3/0/6/130640071/bideseles.pdf
    • http://samandabeschildcare.com/uploads/1/3/0/6/130621818/fikisafamuvov-kikuwakafev-jaduzebilu.pdf
    • http://mail.gridleypaige.com/uploads/1/3/0/3/130323908/3285824.pdf
    • http://www.photoretc.com/uploads/1/3/0/6/130604250/jarovamo.pdf
    • http://nftebayarea.org/uploads/1/3/0/3/130323181/6532653.pdf
    • http://katehardingllc.com/uploads/1/3/0/3/130379435/bijipafufofapozawoz.pdf
    • http://www.bestlittlesouschef.com/uploads/1/3/0/4/130489696/d589794b07bf.pdf
    • http://mail.fountainheadrandm.com/uploads/1/3/0/4/130490328/26730287054ea.pdf
    • http://myindependentkids.com/uploads/1/3/0/7/130776702/38664ef2eb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fca.bin
dd1f65a7509cc5ea6048e3a677119d47241c8a7363a7a55381149ccb7d989698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCA 9176 bytes
font_01_sfnt_off00009118.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9118 2616 bytes
font_02_sfnt_off00009a4c.bin
451895f61762ee2c92071758aadde1050fcd1a41f8262062c25ecb60f5c137f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4C 16340 bytes

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