Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3bd5b41e601471…

MALICIOUS

PDF

44.1 KB Created: 2020-03-08 07:07:22 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a6783f7700f6c0d9daef1461ea52b345 SHA-1: d90d8b8b98df2d789601c74418eea1f41549898d SHA-256: 0f3bd5b41e601471b606922a5e7751aa70eff066b2c31b22243ec86d23f13807
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded external links, identified by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains several URLs that are also listed in the extracted URLs. This behavior suggests the PDF is designed to redirect users to a large number of other PDF files, likely for SEO manipulation or to distribute further malicious content.

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://www.johannashomecare.com/uploads/1/3/0/6/130620965/130620965.html#agere+sequitur+esse+traducir
    • http://wedonotwalk.com/uploads/1/3/0/7/130776308/1ac47bd01125b.pdf
    • http://tappycard.io/uploads/1/3/0/3/130379295/nowatir.pdf
    • http://lssda.com/uploads/1/3/0/8/130813395/pebibawogafifide.pdf
    • http://hostmaster.thelenches.org.uk/uploads/1/3/0/4/130435633/jabafa_polidofi_besikokeniwej.pdf
    • http://www.enidecologyoftalent.com/uploads/1/3/0/6/130620536/majalalev.pdf
    • http://www.labradoodlesrus.com/uploads/1/3/0/6/130604487/someturepokom.pdf
    • http://crcphotobooth.com/uploads/1/3/0/3/130323930/8373155.pdf
    • http://readwritebake.com/uploads/1/3/0/4/130483937/xabalu.pdf
    • http://therintins.com/uploads/1/3/0/5/130544672/vudof_gutar.pdf
    • http://thevioletvalentine.com/uploads/1/3/0/9/130969639/5345365.pdf
    • http://mx.aidenwiselove.com/uploads/1/3/0/5/130550768/9952856.pdf
    • http://www.twinbrotherspainting.com/uploads/1/3/0/4/130435893/d272b7.pdf
    • http://bryhern.com/uploads/1/3/0/6/130604371/leganeguzemevutuleg.pdf
    • http://verifiedoverviws.com/uploads/1/3/0/6/130621298/zuxetaba.pdf
    • http://topshamfinearts.com/uploads/1/3/0/2/130270937/552048.pdf
    • http://mta-sts.mail.swabysessions.com/uploads/1/3/0/6/130603836/ff568485fa.pdf
    • http://mail.mfindia.org/uploads/1/3/0/8/130813848/97ff0b88d.pdf
    • http://huatequelive.com/uploads/1/3/0/6/130604338/2136510.pdf
    • http://www.rockymountainpsych.org/uploads/1/3/0/7/130740368/rifaxav.pdf
    • http://www.thereclaimedworkshop.com/uploads/1/3/0/9/130969434/medipafejag.pdf
    • http://www.nataliegarzastyle.com/uploads/1/3/0/6/130620491/julizejigat.pdf
    • http://firesprinklerordinances.com/uploads/1/3/0/4/130483566/2514439.pdf
    • http://homehotel.net/uploads/1/3/0/2/130272458/565363.pdf
    • http://realestatephotographertampabay.com/uploads/1/3/0/5/130542865/sitinarekuximisijur.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_off0000809a.bin
d31c67deeda410e33eb10894eb0cda2042a54d504baf1b70cc7a677f3c5e12a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x809A 8892 bytes

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