Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3b7b4ac5b8c84b…

MALICIOUS

PDF

41.7 KB Created: 2020-10-02 02:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 15d47071001c88c5dae823290d554500 SHA-1: 95690a90b637fb8d801726bd2b0c6cb57aa5e807 SHA-256: 2e3b7b4ac5b8c84b41c24e6f735e3878f86ad5232a18466d176bc4207f5d4e93
242 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/strik?keyword=oedipus+the+king+robert+fagles+pdf In PDF document text
    • http://files.k2ap.net/uploads/1/3/0/8/130813558/4e7adbc1.pdfIn PDF document text
    • http://files.buenprovechoblog.com/uploads/1/3/1/6/131636941/vofivetiko.pdfIn PDF document text
    • http://rowop.alflovvold.com/uploads/1/3/1/6/131606177/wafizuwe-mubalosurafote-zunuwabunal-worujamurexabof.pdfIn PDF document text
    • http://gawifit.abundantlivingpsychologicalandcoachingservices.com/uploads/1/3/0/7/130739704/vivitotomezoz.pdfIn PDF document text
    • https://site-1036633.mozfiles.com/files/1036633/pavanelabon.pdfIn PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/97859199335.pdfIn PDF document text
    • https://site-1038920.mozfiles.com/files/1038920/sebumuxo.pdfIn PDF document text
    • https://site-1036925.mozfiles.com/files/1036925/74035234303.pdfIn PDF document text
    • https://site-1037274.mozfiles.com/files/1037274/8136896818.pdfIn PDF document text
    • https://site-1037246.mozfiles.com/files/1037246/76693638379.pdfIn PDF document text
    • https://site-1036938.mozfiles.com/files/1036938/49690668776.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/42476107632.pdfIn PDF document text
    • https://site-1036811.mozfiles.com/files/1036811/fazulubak.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/pebugosupi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6092/8405/files/meanings_of_flowers_in_japan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3893/3146/files/63739605702.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5485/3027/files/arroz_con_cebolla_recipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8545/8336/files/minecraft_pocket_edition_14.1_apk_download.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5719 5416 bytes
SHA-256: ad2222359c629852e1cb8c696275e4a8d4ba70ca98132d21fb95796dfa9e0696
font_01_sfnt_off00006972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6972 9880 bytes
SHA-256: 31b35a693d2151952ba8a0e4e5a4c18026f7885a9f09aea09297870a958f8e04
font_02_sfnt_off00008b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378