Malicious PDF — malware analysis report

Static analysis result for SHA-256 538bb885765b161d…

MALICIOUS

PDF

46.7 KB Created: 2020-11-02 13:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 118790d2cec4650bebd0e2ca1ab06054 SHA-1: af18961f0ebe43ac17fb188be11f0fe9656d767c SHA-256: 538bb885765b161df97fad5623a71fdcfaa25c489260f1937973595cf4e208fc
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/aws?keyword=xdm+guide+rod In PDF document text
    • https://wulonuvesiga.weebly.com/uploads/1/3/4/3/134362584/lepakumelemepafe.pdfIn PDF document text
    • https://dududisekit.weebly.com/uploads/1/3/4/3/134348084/majanem.pdfIn PDF document text
    • https://risimapi.weebly.com/uploads/1/3/4/3/134321435/lemamew_zemodi_weziwimotusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005903.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005903.bin)
    • https://s3.amazonaws.com/vufupu/bayesian_theory_and_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/957de8d3-3336-443d-8878-4cd8721dedf0/suparafatiguzav.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/fimuw.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/el_recurso_del_metodo_alejo_carpentier.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/diagnostico_comunitario_de_salud.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/32731834707.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/grow_castle_hack_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/blank_world_map_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e2895d-81a0-43d0-afac-91c0658e105b/ti_84_plus_ce_vs_ti_84_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/39634976152.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/sibofifonopozarofijur.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/gumaton.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 extracted file (font_00_sfnt_off00005903.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_02_sfnt_off0000945f.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off0000945f.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5903 4704 bytes
SHA-256: 253bec2c227a3c7dc99e4e999ae940b5af152374e3d2c02bc81a1dc4da56ffda
font_01_sfnt_off000068e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68E8 13664 bytes
SHA-256: 8fc5bf24e55d414326d73a6ef89dfaabb838172210c8228a2124f9adfb9ff538
font_02_sfnt_off0000945f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x945F 17628 bytes
SHA-256: 448b708b3e9e1419a74c5c210a0c20dc39be91cdf21716409f4c8946de6e73e3