Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc19c6c8393eb80b…

MALICIOUS

PDF

60.8 KB Created: 2020-10-04 06:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e59a77f1103d1bd022ebecb28b3f47cc SHA-1: bd85d82a56e7ad3de6b06a5fd1851588112e1579 SHA-256: bc19c6c8393eb80b20aad2b6ebba93671ecd686216dbf645a4a5944bb622a7b6
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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=introduction+au+droit+cours In PDF document text
    • http://fifuba.jymshd.org/uploads/1/3/2/8/132814930/47ac063.pdfIn PDF document text
    • http://godemelu.turiyaautry.com/uploads/1/3/1/6/131637316/nezagug-josixi-mawiz-dulakurokiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6185/0524/files/colt_sp1_stripped_upper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9617/7816/files/chi_square_practice_problems.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4523/9456/files/vizio_razor_led_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0158/8123/files/tome_berserker_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9913/1556/files/subject_verb_agreement_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7589/4422/files/sojotoxipodozifobituvapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3266/9081/files/moss__associates_columbia_sc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7642/2306/files/80951478934.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/reglas_del_voleibol_mas_importantes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5148/7910/files/coleman_mobile_home_furnace_wiring_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4979/7790/files/11617504675.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/fenudo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD78 4836 bytes
SHA-256: a547eccd0b36b5520a35eeaa7c01ea917419e27ee1016195396e6505bea0129f
font_01_sfnt_off0000bdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEF 12368 bytes
SHA-256: ed218f07b5b4f05c01587ea85ac5accb30b0015ca37f7c66e5f95f6563d488f4

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