Malicious PDF — malware analysis report

Static analysis result for SHA-256 94582484f76820af…

MALICIOUS

PDF

74.8 KB Created: 2021-02-26 12:35:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ec02c079d0df4e32a377cb6b9c3e50bc SHA-1: ba5c9b48dfd7c0428089126c14d387dfb1752208 SHA-256: 94582484f76820af64664a011c810d77422928e0bdbc4c085256b38510863368
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily corrupted, suggests a lure related to 'metric system conversions worksheet answers', which is likely a pretext to encourage users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://crophysi.ru/award?keyword=metric+system+conversions+worksheet+answers In PDF document text
    • http://ch-bewertung-2888.xyz/gozofele14ns5.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/2qxsntC/rent_amc_movie_theater_near_me.pdfIn PDF document text
    • http://sluzhba1.net/likowoloyi2q1.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/rcog_guidelines_for_gdm_2017k8lr0.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/kifSkiA/ombre_nails_pink_and_white_glitter.pdfIn PDF document text
    • http://afracheat8.xyz/velodrome_bike_weightdkjbh.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/cifU1QK/dream_score_soccer_champion_unlimited_money.pdfIn PDF document text
    • http://hermidkovo.info/zupexukavibadokazuxero9k8k5.pdfIn PDF document text
    • http://nnorm-id.com/27748399046b7vx3.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/gSu8hiZ/crystal_islands_spyro_gems.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelojid/fygjq8i/rapid_transfer_usd.pdfIn PDF document text
    • http://swiss-gear.store/34998161611hnxde.pdfIn PDF document text
    • http://sentytld.online/rimibusugatazademijuzbc5dk.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/dKE6abT/basketball_stars_unblocked_full_screen.pdfIn PDF document text
    • http://cheapkeys.site/dymo_letratag_100h_label_makermv0d5.pdfIn PDF document text
    • http://uuuuull.space/fr_leavis_the_great_traditionzaypl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://torasimi.rf.gd/powosodib.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_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 5332 bytes
SHA-256: 23b29245d2b0d747ff81245ea708e6eb77dd44f9f23f815fb3e1fbb1ac27a6ec
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 11444 bytes
SHA-256: d658a3aa098a58cc0b554ec435f547548f585d46bd2195e8c0750f42f4e6969d

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