Malicious PDF — malware analysis report

Static analysis result for SHA-256 759585656dfbefd3…

MALICIOUS

PDF

37.8 KB Created: 2020-04-05 09:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de72340b2ade216543bdc879d1397897 SHA-1: e02f11d0493c0ee0d6f8d2a44e8112bf814c05be SHA-256: 759585656dfbefd3cd9c11fa0cef21900e161e0ea24daba2edabd998ae36cf60
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, pointing to various domains. The ML classifier strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to direct users to potentially malicious external content, possibly for SEO manipulation or to host further malicious payloads.

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://mudiyang.com/uploads/1/3/1/1/131163956/131163956.html#samsung+se-506ab%2Ftsbd+driver
    • http://jbhomeimprovements.builders/uploads/1/3/0/8/130874266/367969.pdf
    • http://integralperformer.org/uploads/1/3/0/5/130539458/bafakawezovise.pdf
    • http://3dtopnotch.com/uploads/1/3/0/7/130739268/a2a5d7bf.pdf
    • http://temirler.com/uploads/1/3/0/7/130738725/2361182.pdf
    • http://mydenson.com/uploads/1/3/0/7/130738504/dedelodafawovugutuj.pdf
    • http://wildlovealaska.com/uploads/1/3/0/6/130639782/2147384.pdf
    • http://innovateaccelerate.com/uploads/1/3/0/2/130288502/xosugowuwofisebotovo.pdf
    • http://davesharpe.blog/uploads/1/3/0/8/130813118/bogiwaxap_salunikawifu_lekuzepawutifa.pdf
    • http://investiguardnm.com/uploads/1/3/0/6/130620666/f934a4c5f7d76.pdf
    • http://100phrases2freedom.com/uploads/1/3/1/0/131069910/zezifojuxarelomekix.pdf
    • http://jarrods.org/uploads/1/3/0/9/130969775/nobukojazeli_mijajuzijewo_liluzubo_dapesogezuvom.pdf
    • http://ganjikaflower.com/uploads/1/3/0/6/130639294/mosajijawuridal.pdf
    • http://chapulincoloradoins.com/uploads/1/3/0/2/130272442/vajezuturigoti.pdf
    • http://refundsaregood.com/uploads/1/3/0/5/130589241/bipas.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_off00006afd.bin
28c26f0174dd6a816d2168eae2788f570b95cd0834b032943d14bd1043d7f6f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFD 7972 bytes

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