Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b5f689f550b73a…

MALICIOUS

PDF

80.5 KB Created: 2021-04-28 09:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 05e4e73dc0bc53b38ca1956674c4f7f3 SHA-1: 27bdd69f2624e2c4fd6e2bbed8b899e166a18cad SHA-256: 56b5f689f550b73a6d06fbbc05d48e0e1a89863ec3355b33b4d6dd4a4a31694c
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=self+esteem+worksheet+for+adults PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423431/normal_6032ac9c6ee70.pdfIn PDF document text
    • http://mangalvpodarok.ru/49155866270mpyyr.pdfIn PDF document text
    • http://nashremont.site/rafudawab4862.pdfIn PDF document text
    • http://fringigejy.site/58969055513fb39v.pdfIn PDF document text
    • http://podcard2020.site/81620567283eu8lm.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/cgehfbh/amazon_alexa_echo_plus_setup.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/tenumuxi.pdfIn PDF document text
    • https://xunimolozabipos.weebly.com/uploads/1/3/2/6/132681728/4262069.pdfIn PDF document text
    • http://dress-russia.ru/zelda_ocarina_of_time_links_age23pll.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380695/normal_5fcdef69aeaab.pdfIn PDF document text
    • http://storezone.info/kukiwomatogarewajuti90cd6.pdfIn PDF document text
    • http://sovetnik53.ru/strategic_marketing_books_freeyu4ox.pdfIn PDF document text
    • http://sakhavto.ru/how_much_does_a_interior_designer_earn_in_australia2ea2q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_600ddfabae2c9.pdfIn PDF document text
    • http://pink-echo.club/jetumalosekalakusovofatexsihva.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/jceiijj/religion_in_japanese_art.pdfIn PDF document text
    • http://wiinorama.website/pajapudakipezekaleludoxaizozo.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/9Uicegd/smash_cube_2048_merge_puzzle_block_3ds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_6049c192970a6.pdfIn PDF document text
    • http://shortsomfj.space/kuvegivuxazofakak9h78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 5408 bytes
SHA-256: 7fecf338adabfd4a44598c2d4f4feba5115bed970f9d9faeb1b2b9bfb6adb578
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 11048 bytes
SHA-256: 9c78810858cf21ed63a2c2d4ad515a84af39977bc2da5b36be505cc8e3a90c1f

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