Malicious PDF — malware analysis report

Static analysis result for SHA-256 45353e3bed43f86f…

MALICIOUS

PDF

39.2 KB Created: 2020-04-05 07:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c99e5c496abebc89c76ce6cd6b774068 SHA-1: ae9afdd901ffbeaec78f335675333991952d63ba SHA-256: 45353e3bed43f86f2efbffd477435561f60154ab66ed0834a6a9cde2e0116eee
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files on different domains. This suggests a link farm or redirection scheme designed to lead users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external PDF link farm. The document body itself contains text related to research projects, likely a lure to disguise the malicious intent.

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://dumbo-octopus.com/uploads/1/3/0/8/130874520/130874520.html#aspectos+y+elementos+basicos+de+un+proyecto+de+investigacion
    • http://hoevedemolenhorst.nl/uploads/1/3/0/4/130489265/sidemakokezu.pdf
    • http://warginna.com/uploads/1/3/0/7/130739332/f6175f.pdf
    • http://parashantiyoga.com/uploads/1/3/0/3/130324370/vuvekeg.pdf
    • http://dronecamvision.com/uploads/1/3/0/6/130621575/dilebemul_jezexov_visivazabi_jubujowakorid.pdf
    • http://cruiseshipmusic.com/uploads/1/3/1/4/131406222/pubadebogigel.pdf
    • http://lifecoachsamantha.com/uploads/1/3/0/4/130489051/4c1bc8f51.pdf
    • http://simpyeventrentals.com/uploads/1/3/1/0/131070431/d27156b.pdf
    • http://streettreat.net/uploads/1/3/1/0/131070761/xizitow.pdf
    • http://thornfoundation.com/uploads/1/3/0/2/130291800/2806366.pdf
    • http://contreraschristina.com/uploads/1/3/0/2/130270779/5e168105b.pdf
    • http://boskgame.com/uploads/1/3/0/7/130776852/ea5ca3a.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_off00006486.bin
d715144175b4276eefa1cb60025bea39b945ddeb7f75552f8af95c688168064e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6486 8480 bytes
font_01_sfnt_off0000834a.bin
97a3418bd433653dafe652ac0a0841cf2f323fe672bd45d4cf3362d7102ed122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834A 2796 bytes

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