Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c50ef4ced975d7…

MALICIOUS

PDF

32.4 KB Created: 2020-03-30 16:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cffe4bacbfe83d19e8c35ba97816dc99 SHA-1: b77b21719a7d4eafb487567f4c87713df9176bc6 SHA-256: 47c50ef4ced975d7b3a95fb3398fdc282716450372c9f5fec7cddd8f85b3b52e
94 Risk Score

Malware Insights

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

The PDF contains a large number of 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, and the presence of numerous URLs pointing to various domains supports this assessment. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack vector appears to be the distribution of malicious links.

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://szambabetonowe-poznan.pl/uploads/1/3/0/5/130588841/130588841.html#on+the+road+again+willie+nelson+song
    • http://claremonthomeimprovement.com/uploads/1/3/1/3/131383959/6099477.pdf
    • http://starktaylor.com/uploads/1/3/0/8/130813692/8573787.pdf
    • http://fes-tx.com/uploads/1/3/0/7/130776341/gativufupovirumaku.pdf
    • http://timmhackett.com/uploads/1/3/0/6/130640142/7824733.pdf
    • http://foxpittman.com/uploads/1/3/0/6/130605440/d42677fe.pdf
    • http://cazadorclub.com/uploads/1/3/0/6/130639581/7483348.pdf
    • http://ministry33.net/uploads/1/3/0/5/130543757/1ea3c72dd9d.pdf
    • http://acardon.com/uploads/1/3/1/3/131378852/sunalafor.pdf
    • http://bricksuglysweaters.com/uploads/1/3/0/7/130739860/dc172a9.pdf
    • http://migrationbot.ca/uploads/1/3/0/6/130604434/9837276.pdf
    • http://gleeaquadragons.com/uploads/1/3/0/7/130739633/31d29bb70.pdf
    • http://mivux.ch/uploads/1/3/0/6/130620952/3889101.pdf
    • http://kikainatrading-drc.com/uploads/1/3/0/6/130620450/56d7cb008f3738.pdf
    • http://tuarbol.net/uploads/1/3/0/7/130740462/7f1201.pdf
    • http://deeprootschristianfellowship.org/uploads/1/3/1/0/131070131/gikibip.pdf
    • http://canalautisme.eu/uploads/1/3/0/5/130551049/fisupilutukifulowiva.pdf
    • http://waxwingdjs.com/uploads/1/3/0/5/130589411/fizisupewiv.pdf
    • http://castmarksa.net/uploads/1/3/0/5/130588605/2126961.pdf
    • http://denovoinnovations.com/uploads/1/3/0/4/130435895/kitirotajolitakepo.pdf
    • http://luckycharminvestmentsinc.com/uploads/1/3/1/0/131071231/5129244.pdf
    • http://tripleeentertainment.com/uploads/1/3/0/5/130588964/e1ffc66.pdf
    • http://rvpartsandcarts.com/uploads/1/3/0/6/130604191/aa24c4b6eca3a6.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_off00005b0a.bin
90d23a8334c2610b8c4f0c96ca1e0c3759e89954e8c5c19b60cd65495cc7707d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0A 6184 bytes

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