Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59b03b5fc5c8d2e…

MALICIOUS

PDF

70.4 KB Created: 2021-02-23 09:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92044827f37962ef1755bc80443605a6 SHA-1: ba27e50f00f6c9dfcc0755d1b6b5e7384d724167 SHA-256: b59b03b5fc5c8d2e693ff11a2695be3b9420f40782b86ce67cf90c993bed42b1
96 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, a common tactic for SEO spam and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, with the primary example being a Weebly URL. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious or unwanted content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://jacksth.ru/wix?keyword=danby+6000+btu+window+air+conditioner+manual
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/jategozon_niwutedunimojeb_sekufumun.pdf
    • http://teleporttur.ru/calligraphy_worksheets_for_beginners70jyh.pdf
    • http://rmk4sale.xyz/wapking_dj_song_201872ioc.pdf
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/2813ab3.pdf
    • http://xevigukek.iblogger.org/brigandine_grand_edition_guide.pdf
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/8383058.pdf
    • https://cdn.sqhk.co/naxusepimosa/ja5lcgf/amazing_cowboy_mod_apk.pdf
    • http://jitokinut.iblogger.org/sap_hana_for_all_entries_performance.pdf
    • https://cdn.sqhk.co/rinugezig/wjeijjj/59671428987.pdf
    • https://cdn-cms.f-static.net/uploads/4460241/normal_60344d4306b44.pdf
    • https://cdn.sqhk.co/fezifoxunif/IhhhIUK/se_ranking_affiliate_program.pdf
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/5798931.pdf
    • http://toportt.online/15274532850es8ze.pdf
    • https://static.s123-cdn-static.com/uploads/4387589/normal_5fc5e9f9be5b6.pdf
    • https://cdn.sqhk.co/vakanaju/hi3gjhb/winter_lesson_plan_ideas_for_preschool.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ee.bin
da42aa40c0fa9d93ad45c3aa89bcff38fab27744ec7f360956707403beb23448
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 5536 bytes
font_01_sfnt_off0000e9bf.bin
416e18c13695d3e6337ff68ec92912e1ee912e7d38e0a89a7bce2add1946e536
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 10112 bytes