Malicious PDF — malware analysis report

Static analysis result for SHA-256 9239be5f346fc2f0…

MALICIOUS

PDF

41.1 KB Created: 2020-03-31 12:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0eb794701bb3b02a527e3af0566079f9 SHA-1: fe2bc58c0864ed16ea04eaf96f92d6948a335dbf SHA-256: 9239be5f346fc2f00e629bc8545e424a65fae0ff1137d76590700ef73641acb4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The primary attack pattern appears to be a link farm designed to manipulate search engine results or distribute malicious content via numerous external PDF files.

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://bigdsuperfoods.com/uploads/1/3/1/4/131453406/131453406.html#escuela+del+comportamiento+humano+ejemplos
    • http://dietrichssportfishingcharters.com/uploads/1/3/0/6/130639776/kupojiwudesake.pdf
    • http://shopdevourdesserts.com/uploads/1/3/0/5/130551794/4d60ea7c3a1cf.pdf
    • http://ladyhawkfarm.com/uploads/1/3/0/4/130488583/xubexipu-gusenego-zelamatedofef-vovelipujarud.pdf
    • http://wearespartanation.com/uploads/1/3/0/7/130776386/fajufumo.pdf
    • http://universallanguage.studio/uploads/1/3/0/7/130776500/9456918.pdf
    • http://erfahrungsberatung.de/uploads/1/3/0/4/130476539/jiwinanekuduta.pdf
    • http://naivetygaming.com/uploads/1/3/1/3/131379567/jefozobebut.pdf
    • http://ikwildieboot.nl/uploads/1/3/0/6/130604701/voreva_najagabube_dumeni_boxoxinovavabi.pdf
    • http://noodlesaftertwelve.com/uploads/1/3/0/8/130874517/77cbfd8e7.pdf
    • http://theaustinproject.org/uploads/1/3/0/6/130622089/9074986.pdf
    • http://squareride.com/uploads/1/3/0/4/130435729/07bf6.pdf
    • http://sublimeinstantlift.com/uploads/1/3/0/9/130969170/sefelu-dujidebonuf.pdf
    • http://nobrandllc.com/uploads/1/3/0/7/130775622/dfa0c.pdf
    • http://fitlifeuniverse.com/uploads/1/3/0/6/130639764/f92a4599595.pdf
    • http://mccookchurchofchrist.org/uploads/1/3/0/4/130436226/6253165.pdf
    • http://pajetdesablemobile.com/uploads/1/3/0/6/130603725/807916.pdf
    • http://abideyourabode.com/uploads/1/3/0/7/130775231/xegujususoxivox.pdf
    • http://melangeemporium.com/uploads/1/3/0/5/130544889/xumojemavufek.pdf
    • http://aaltosolutions.com/uploads/1/3/1/1/131163734/jureradalab.pdf
    • http://nickidenicki.com/uploads/1/3/0/6/130603978/b1d148fc61.pdf
    • http://coachmickey.ca/uploads/1/3/0/4/130435638/fetoje-vosezusinipanuv.pdf
    • http://ericwilsongolf.com/uploads/1/3/0/6/130620950/muwaperuwug.pdf
    • http://onlyinlamovie.com/uploads/1/3/0/6/130603905/bedurakavujoz-fujogeworeloka.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_off00007837.bin
913cde89ef5d66ddf3110aa76df3fe6207fe7434598276d6c4afcfcc563fb068		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7837 7752 bytes

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