Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3575ab42a730a2…

MALICIOUS

PDF

70.4 KB Created: 2021-02-13 21:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 418450504ea143a0c7acc7d255ad8cf4 SHA-1: d3baa9c448030008614a6dfb89d5756c049c99dc SHA-256: 1b3575ab42a730a2f0a0e4824891f8df81662a678c1aed2a735fd9b94706703b
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://crophysi.ru/123?utm_term=edward+said+orientalism+chapter+summary In PDF document text
    • https://cdn.sqhk.co/terasovo/hS32FTK/pexatuzikufogaw.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/6Ajhig0/78623148420.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/67682e2bf.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/efMicuv/sepupedukewirokinasox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501495/normal_5fdb695a93d3c.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/jghaihQ/wsdot_ferry_wait_times.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/Ynjgdhd/rusemamebaxujutatena.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/motazijikaledin.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/hek4Fx3/vasamizukenomuwixagevoz.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/jzgdhbB/27613880289.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/heGheD2/7467355896.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/6165028.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/ijbvSxw/rocketman_lyrics_and_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/Kr5wgdq/ps1_emulator_for_windows_phone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/watajive/nigewaforimusojadival.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_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 5464 bytes
SHA-256: 93f39a950207bec3bb3fbf286d2c87518a4809de88ef143ddbf0108e7615fcd6
font_01_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 9904 bytes
SHA-256: 21ee12a87fdb3fdb2e9db11bc6cc195b55a3eb1bc1a53bbd3b56fd21204515c4

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