Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5707f7dedd8e51b…

MALICIOUS

PDF

49.7 KB Created: 2020-03-29 07:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fa73ccd1412d2585d18adb5c2aa554ab SHA-1: b8502df2e6a35e3a633cef141753071f0be3c1d9 SHA-256: d5707f7dedd8e51b5bfc7425517e5771ce24d0f95c173dcb5049986c68e21870
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body, though partially corrupted, includes a title related to educational content ('Problemas de fracciones mixtas para secundaria') which is likely a lure. The primary heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links generated to manipulate search engine results, suggesting the document's purpose is to drive traffic to these malicious sites, likely for malware distribution or phishing. No scripts were extracted from this sample.

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://74-123-79-26.mgwnet.com/uploads/1/3/0/6/130621844/130621844.html#problemas+de+fracciones+mixtas+para+secundaria
    • http://bearcatbfcsoccer.com/uploads/1/3/0/7/130775558/wusuwogogidejisagu.pdf
    • http://www.classidisocializzazione.org/uploads/1/3/0/5/130544790/c66bf881a05e1.pdf
    • http://peake.design/uploads/1/3/0/8/130814900/7229229.pdf
    • http://mail.velchavelchev.com/uploads/1/3/0/4/130477335/sofovadorijemulo.pdf
    • http://gioventuidente.com/uploads/1/3/0/3/130323154/6765549.pdf
    • http://adaptiveaging.com/uploads/1/3/0/3/130323765/pikapowukekuvipek.pdf
    • http://gregcomechanical.com/uploads/1/3/0/4/130483447/38deb17e.pdf
    • http://create115.org.uk/uploads/1/3/0/8/130813979/4084049.pdf
    • http://virtualpoe.com/uploads/1/3/0/5/130588494/82715e21efcfbd.pdf
    • http://southbay-peninsula-rc.com/uploads/1/3/0/5/130550750/b6b648ee8cc.pdf
    • http://nbc-heads-up-poker.com/uploads/1/3/0/6/130640021/b38d119750c1.pdf
    • http://swoapy.com/uploads/1/3/0/6/130621075/3656132.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d6c.bin
94ab917b4eee63f37cfd5b4402d80bc39f0a085c1c4f13664a0b00a6b708c520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6C 10256 bytes
font_01_sfnt_off0000a277.bin
19b3275977330ac3ccb9620a693a94e951843036533779dfd3c6e2a395b003ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA277 16152 bytes

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