Malicious PDF — malware analysis report

Static analysis result for SHA-256 1719671b7050ef7c…

MALICIOUS

PDF

33.5 KB Created: 2020-04-16 03:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 807a917780ea7954053df79f836476ba SHA-1: 9fdba36fc734f63a250edc4685aaf8cca57f61cc SHA-256: 1719671b7050ef7c7d8aaf85bf56bc6977467a0a13f130fb301f0dc0d0cf60ff
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list. This suggests the primary purpose is to redirect users to a network of websites, likely for SEO spam or to host further malicious content.

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://bestcitycleaningservices.net/uploads/1/3/0/7/130738568/130738568.html#lista+giocatori+fantacalcio+gazzetta+dello+sport+pdf
    • http://blondabsgiftboutique.com/uploads/1/3/0/7/130740573/7322955.pdf
    • http://katrinahigham.com/uploads/1/3/0/4/130483572/f4bae11875d0.pdf
    • http://lezlymadrigal.com/uploads/1/3/0/6/130604630/1638379.pdf
    • http://deboraholmes-aspiritmessage.net/uploads/1/3/0/2/130272071/sebufewaz-dewelunesaxezi-favesagebazepe.pdf
    • http://polliteracy.com/uploads/1/3/0/4/130435835/fozotekexobe.pdf
    • http://bess-hudson.com/uploads/1/3/1/4/131408252/nikim-bisikixav-nelewotoli.pdf
    • http://madasahatterptown.com/uploads/1/3/0/2/130289184/xobapun_lotedoroj.pdf
    • http://s-p-q.org/uploads/1/3/0/7/130775537/b1ef0b77cb.pdf
    • http://joplintire.com/uploads/1/3/0/6/130621819/nitit.pdf
    • http://wholehousellc.com/uploads/1/3/0/7/130776088/rukefozujomel.pdf
    • http://isrsurvivalswimming.com/uploads/1/3/0/3/130379155/65506.pdf
    • http://hongkonglightingandsound.com/uploads/1/3/0/7/130739831/3188383194c.pdf
    • http://barbarapulst.net/uploads/1/3/0/2/130289571/pogokatowepane.pdf
    • http://kaylenforasvp.com/uploads/1/3/0/7/130776314/8790500.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_off000058de.bin
10d658f2f0fe6e56974dddff2408cca2800988782ba7ea5c6e124dfa54a11e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58DE 8408 bytes

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