Malicious PDF — malware analysis report

Static analysis result for SHA-256 0520fd331f7d9079…

MALICIOUS

PDF

32.9 KB Created: 2020-04-03 04:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 91e7962de7926816b1da880b38a0c36f SHA-1: 5b0eb354aee63aa5f0ab4a26005815df2e27d3e1 SHA-256: 0520fd331f7d907900ffa1fafa0e4e3ae000403683d0e73ca6f9f02940b5fabd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links. While no scripts were extracted, the sheer volume of outbound links and the ML score suggest a malicious intent, possibly to drive traffic or host malicious content on the linked pages.

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://sgmtrack.com/uploads/1/3/0/7/130775715/130775715.html#precalculus+trigonometry+review+worksheet+pdf
    • http://mark5proofreading.com/uploads/1/3/0/5/130588191/ac8382eff27.pdf
    • http://mx.heproco.com/uploads/1/3/0/4/130436125/sowovod.pdf
    • http://cordiallyinvited-designs.com/uploads/1/3/0/6/130621376/litebafejatikobep.pdf
    • http://beautycloud.net/uploads/1/3/0/4/130478868/baneleguvajibat.pdf
    • http://pasasdenademocrats.com/uploads/1/3/0/8/130813883/364388.pdf
    • http://socialco.us/uploads/1/3/0/6/130639851/5200957.pdf
    • http://jeffhagemandesigns.com/uploads/1/3/0/7/130775820/gidenatux-dajuv-zisedawizekob.pdf
    • http://livewellbeactive.com/uploads/1/3/0/5/130544321/xenewejijaxabedeje.pdf
    • http://www.remivistainc.com/uploads/1/3/0/3/130379424/6223367.pdf
    • http://love-respect-faith.com/uploads/1/3/1/4/131482832/7880871.pdf
    • http://tajan.pl/uploads/1/3/0/2/130271161/momazegefelemo.pdf
    • http://iampreformance.com/uploads/1/3/0/4/130483819/4811710.pdf
    • http://sunnydaybeachwear.shop/uploads/1/3/1/0/131070272/jozivubuke_texiwilikotu_vukudipujor_wetirip.pdf
    • http://oceanwavestravelco.com/uploads/1/3/1/0/131070508/dekumu_kofiwola_fuzixawe_detufaret.pdf
    • http://simonsformalaugusta.com/uploads/1/3/0/2/130291766/jojivovezuvegit.pdf
    • http://buddygab.com/uploads/1/3/0/5/130550652/kolutexijawoxej.pdf
    • http://npep.com/uploads/1/3/0/7/130775619/giguwapeziwone.pdf
    • http://foxprofessionals.org/uploads/1/3/0/8/130874429/lizune.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_off00005b81.bin
a0d8e6c11af81231394d513bc024c64373230133b9ec45e4e4b085e16b0fe3ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B81 6892 bytes