Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1cc27ef4bfc040…

MALICIOUS

PDF

38.7 KB Created: 2020-04-08 10:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ba7fe45535e019a4f813413a5563238 SHA-1: 8d2011cb7e7fa5904d026b9e79dffdde7a4cb022 SHA-256: ca1cc27ef4bfc0402c7d62e11b03d49c2919721dd77a151c5f12ce548560993e
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The document body text is heavily obfuscated and appears to be a mix of metadata and corrupted content, but it does contain references to the URLs found in the heuristics.

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://fatgrandmadips.com/uploads/1/3/1/0/131070035/131070035.html#propiedades+fisicas+y+quimicas+de+los+hidrocarburos+arom%C3%A1ticos
    • http://southmeadandco.com/uploads/1/3/0/7/130738969/bajenupokubewu-nevatejaxop-tiwobixeseg.pdf
    • http://detroitmobilenotary.com/uploads/1/3/0/8/130874231/vetovis-remezo.pdf
    • http://cavapoocafe.com/uploads/1/3/0/6/130604279/8f9618c35.pdf
    • http://surrenderministriesforwomen.com/uploads/1/3/1/4/131453823/58e336a9c.pdf
    • http://lavenderlust.com/uploads/1/3/0/3/130379841/e5683f8699945.pdf
    • http://huntcountyjobs.com/uploads/1/3/0/2/130291416/bojijidasoda.pdf
    • http://theredwoofinn.org/uploads/1/3/0/6/130620340/dapuwur_rumibe_mikedoz.pdf
    • http://scheriegates.org/uploads/1/3/0/5/130590443/zovut.pdf
    • http://brothersphotographers.com/uploads/1/3/1/4/131408159/jufexizekod.pdf
    • http://1on1boxingfitness.com/uploads/1/3/0/4/130488779/75d4d6.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_off0000628f.bin
94044556fd12c8d09c9660e58cfe908c2ad9e3a81931bd5361aad8a2a2ba1104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x628F 8436 bytes
font_01_sfnt_off0000814d.bin
ad6001544931b982f6f7da1832bf13fec8344b0eac1307571a142e09cd2bc38c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814D 2628 bytes

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