Malicious PDF — malware analysis report

Static analysis result for SHA-256 e178921d92d2015c…

MALICIOUS

PDF

39.9 KB Created: 2020-03-24 01:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: edc305bbc01f6450d5c518d8b67e46a1 SHA-1: ce240fbe201cc10e1b86b2f955523782b6990ce0 SHA-256: e178921d92d2015cc344992923aaad4252420921a21b17e6bcf79f492f03b486
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The document body text is heavily corrupted, but the presence of URLs and the PDF_SEO_LINK_FARM heuristic suggest the primary intent is to redirect users to a network of malicious or spam-related content.

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://clickinteriordesign.net/uploads/1/3/0/6/130605338/130605338.html#que+es+malaria+o+paludismo+yahoo
    • http://davidhopkins.info/uploads/1/3/0/5/130551671/wefunik.pdf
    • http://unityoflight.org/uploads/1/3/0/3/130379126/89729ff6.pdf
    • http://meredithbirrell.com/uploads/1/3/0/6/130621116/xopavowanala.pdf
    • http://boyoodie.com/uploads/1/3/0/2/130289773/fuwofirilarekokiz.pdf
    • http://kimberlymalito.com/uploads/1/3/0/9/130969659/2818904.pdf
    • http://mortargroutepoxy.com/uploads/1/3/0/4/130489434/c6850ad.pdf
    • http://cheappalletforks.com/uploads/1/3/1/0/131070124/f9d551d4807.pdf
    • http://badcathalloween.com/uploads/1/3/0/2/130288514/suzedemov.pdf
    • http://paschaliansato.com/uploads/1/3/0/4/130476146/kesiw.pdf
    • http://webdisk.apple-tutoring.com/uploads/1/3/0/3/130313265/nukulutof.pdf
    • http://distribuidoramrb.com/uploads/1/3/0/5/130543536/risalebirakafuwamok.pdf
    • http://hostmaster.amberjewellery.co.nz/uploads/1/3/0/6/130620594/tovoxebopu_zivixotiv_piridoxuviv.pdf
    • http://balticsportsciencesociety.com/uploads/1/3/0/2/130272905/6600929.pdf
    • http://cheapsmokesandphones.com/uploads/1/3/0/8/130874330/wumosifekoxinat.pdf
    • http://autopartes.com.co/uploads/1/3/0/2/130291713/zokademuxa_paxititinizu_wamerowotimuz.pdf
    • http://nasimofoods.com/uploads/1/3/0/5/130546290/tugupoti.pdf
    • http://smithsjoinery.com/uploads/1/3/0/4/130435986/1160324.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_off00007031.bin
fc3085c52065fb71645541384bac16f75edd95d5d48bd8c6f5fc85ea773c63b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7031 9256 bytes

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