Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa7521d24a1c382…

MALICIOUS

PDF

37.3 KB Created: 2020-04-04 08:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0029e2df4c05a93f6fb592a2c2382dbf SHA-1: 44994a2d24236415f9cbe8a509bf30d66ebc4aac SHA-256: 5aa7521d24a1c38211000e4ab29364acfa888028369beb689bfc1b23614984f8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to redirect users to potentially malicious content or to manipulate search engine rankings.

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://browbeautiful.net/uploads/1/3/0/5/130546294/130546294.html#concepto+de+el+conocimiento+empirico
    • http://tenthousandgloves.com/uploads/1/3/0/6/130640223/f9892.pdf
    • http://serviciosequimas.com/uploads/1/3/0/7/130776516/tukasuwoxebela_vilavobakum.pdf
    • http://obrienventures.com/uploads/1/3/1/4/131437330/9006541.pdf
    • http://silverbirchhomestead.com/uploads/1/3/0/6/130604288/9a5ad8128.pdf
    • http://ldsgirlscamptees.com/uploads/1/3/0/2/130289632/bekemepewabawudebu.pdf
    • http://torreypinesfinancial.net/uploads/1/3/0/2/130289738/gonukowaku.pdf
    • http://festivallatinosacramento.com/uploads/1/3/0/6/130639309/af26b669047.pdf
    • http://sarasbellur.com/uploads/1/3/1/4/131437421/5197045.pdf
    • http://we-have-hope.com/uploads/1/3/0/8/130874329/a75c21f7d0fdb.pdf
    • http://arkansaspropertymaintenance.com/uploads/1/3/0/6/130621772/2317934.pdf
    • http://trilliumhillfarm.net/uploads/1/3/0/3/130313529/9841e13e900ac5.pdf
    • http://astridstyling.com/uploads/1/3/0/8/130813866/vadib.pdf
    • http://magandashoping.com/uploads/1/3/1/1/131164198/74b93aa8a.pdf
    • http://my-h-online.com/uploads/1/3/1/4/131453984/jigotopo.pdf
    • http://brendabeattie.com/uploads/1/3/0/7/130739493/ce695a79b042.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_off00006944.bin
b03ea4c849b994a3a8db6764936cb132a2114c798b9a77549e2ad1c9bf14560a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6944 8036 bytes

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