Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e75e4a53efaec69…

MALICIOUS

PDF

35.6 KB Created: 2020-06-15 17:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2552df7e9c0b292aef49f04cda469d3 SHA-1: af595978a0e103c4103b745a0e2b4334fa16d9b8 SHA-256: 3e75e4a53efaec698a5c0298404e0dda7ffa7a290dca57ad22a8ca87fa557775
94 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains a large number of external links, many pointing to domains that appear to be part of a link farm. The document body, though partially corrupted, contains text related to web design tutorials and includes URLs that are likely used to redirect users to malicious content. The primary attack pattern involves using a seemingly innocuous document to drive traffic to a network of potentially harmful websites.

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://reapernetwork.club/uploads/1/3/0/4/130488087/130488087.html#web+design+tutorials+for+beginners+free
    • http://creativeartideas.com/uploads/1/3/0/9/130969674/faf607f6a.pdf
    • http://belacaraph.com/uploads/1/3/0/4/130435930/d35f533c3faa.pdf
    • http://aesystems.org/uploads/1/3/1/4/131453695/bitabutofififekufebo.pdf
    • http://silverarrowdetailing.com/uploads/1/3/0/2/130292007/287242d2.pdf
    • http://goolsbygreatdanes.us/uploads/1/3/0/5/130551607/vimemo.pdf
    • http://daybreakerstest.com/uploads/1/3/0/6/130639747/liwuvadexopimek.pdf
    • http://jerrytunney.com/uploads/1/3/1/3/131398077/e5c1b5f6f.pdf
    • http://urgent1.com/uploads/1/3/0/6/130621776/1cb5d29b.pdf
    • http://jewliesjewels.com/uploads/1/3/0/5/130590482/kutibuvezebudobuwela.pdf
    • http://kindermusikwithlorraine.com/uploads/1/3/0/5/130550700/2fdc4670114.pdf
    • https://jotozagobom540614489.files.wordpress.com/2020/06/82171346108.pdf
    • https://zegekodejove.files.wordpress.com/2020/06/dewiwuripuvekuk.pdf
    • https://zaferogo.files.wordpress.com/2020/06/78295482725.pdf
    • https://xeveralim.files.wordpress.com/2020/06/46908921828.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_off00005edc.bin
6cd1780eb5ac9fce8aadde8fc107e0509dbc5227c8a64fbef94146d35e337eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDC 10636 bytes

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