Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4faeb7b49a7991…

MALICIOUS

PDF

53.8 KB Created: 2020-03-15 01:38:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4e369d7e59bc34656e7c8e27e33088dc SHA-1: c6c4b0a59b3c1a2ea77a2cab211762c80cf73913 SHA-256: 5f4faeb7b49a7991aedac3709a804d9eeae1a9f3123754fc11b583973ddc2152
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains URLs that are likely intended to redirect users to malicious content or phishing pages. The ML classifier strongly indicates malicious intent.

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://webdisk.jennifermannauthor.com/uploads/1/3/0/3/130323672/130323672.html#books+online+pdf+free
    • http://www.utahleadmagnet.com/uploads/1/3/0/6/130621352/telujope_libugesanotekof.pdf
    • http://mx.rockypointboatdock.com/uploads/1/3/0/7/130776562/cff22cda0.pdf
    • http://neurocogconnect.org/uploads/1/3/0/7/130775462/6562517.pdf
    • http://easyprovids.com/uploads/1/3/0/6/130621208/novoradokonal.pdf
    • http://thegroove.kitchen/uploads/1/3/0/6/130621516/1708973.pdf
    • http://kingdomdvlpr.com/uploads/1/3/0/3/130313183/9f926e4aa.pdf
    • http://vitalowcountry.org/uploads/1/3/0/2/130288562/zezukige.pdf
    • http://kayserathletics.com/uploads/1/3/0/6/130639743/pezatevimaba_puxofasigo_zurunuxebotape.pdf
    • http://www.devotionswithdennis.com/uploads/1/3/0/4/130494743/gaxem-rameta.pdf
    • http://soulsforkids.com/uploads/1/3/0/3/130313388/0f94271fda2.pdf
    • http://lippincottllp.com/uploads/1/3/0/6/130621215/bcc35a599a4ef4.pdf
    • http://nevenann.com/uploads/1/3/0/7/130776385/bovulukitisokowafeb.pdf
    • http://advantageonellc.com/uploads/1/3/0/6/130639454/09ae27d48e8.pdf
    • http://elaineytang.com/uploads/1/3/0/6/130620949/xitowotolanopid_setasuxuwigo_demixofosi_tilum.pdf
    • http://biscuitandball.com/uploads/1/3/0/8/130813800/fabivubuwa_vewemorubif_pijivafumuzo_lugitupipo.pdf
    • http://www.mixologyformama.com/uploads/1/3/0/4/130435888/lisafasadat-fukowox.pdf
    • http://telegramtees.com/uploads/1/3/0/7/130739971/zikuwepiriked.pdf
    • http://samanthahu.com/uploads/1/3/0/5/130539102/wejikinufudujaliw.pdf
    • http://inskydigital.com/uploads/1/3/0/4/130488666/065b5.pdf
    • http://cavinfitness.com/uploads/1/3/0/4/130477414/libigebefovefa_suwebelare_menaxiw.pdf
    • http://matankorin.com/uploads/1/3/0/5/130551185/banemizedelupo.pdf
    • http://elispinheirobellydance.com/uploads/1/3/0/3/130313089/3417934.pdf
    • http://www.my-zaps.com/uploads/1/3/0/3/130323733/wopenukulari.pdf
    • http://www.emilyeportfolio.com/uploads/1/3/0/6/130603709/55c45a33b2140.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000954e.bin
b0d3c689b63260ed7925a30fea3241eaceea9a54b0a13f90d4bdafb8706b583d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x954E 8148 bytes
font_01_sfnt_off0000b486.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB486 16036 bytes

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