Malicious PDF — malware analysis report

Static analysis result for SHA-256 de638245fac18169…

MALICIOUS

PDF

77.1 KB Created: 2020-12-25 12:51:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d59873367350733c4e6dc287641afb4e SHA-1: efd25ce1a44f3698d43fbbaef5b3741b0b7ce95e SHA-256: de638245fac18169eabe929bb8f4e9b5f22692fd25585f1dc440374962d4d687
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The presence of a 'download button' heuristic further suggests a deceptive lure. While no scripts were extracted, the embedded URLs indicate a phishing or scam attempt, likely aiming to trick users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?utm_term=mi+default+music+player+apk In PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/c1cdcf0e37d949.pdfIn PDF document text
    • https://ximapufem.weebly.com/uploads/1/3/1/4/131437784/8f6ef.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/ejgujiQ/35113400463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_5fa0d76247344.pdfIn PDF document text
    • https://cdn.sqhk.co/kipasewimoni/jdhiLhe/jidididajujizutibegi.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/5849204.pdfIn PDF document text
    • https://cdn.sqhk.co/vetesomiw/bjdfjGp/video_downloader_for_instagram_inshot_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sononipo/ehfghjb/gilogalipelupa.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/pisik/40631904144.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/mathematical_reasoning_notes_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/event_planning_contract_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/2011_chevrolet_traverse_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/forward_contract_act.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/ielts_placement_test.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/toy_box_killer_transcript.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB09 10048 bytes
SHA-256: 81091fbc4689c9baec48b245c4ac68f681657aaa85609efe219f7d8184a0e6fd
font_01_sfnt_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 5472 bytes
SHA-256: 1b5523f8f14756d0fbed61b5b690c6545b57a4fad785de6848850d4de79eac5a
font_02_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 10392 bytes
SHA-256: 32aff32e7069488dfe4c13d3be0be82142ac241e0e516159e535a70eb441574e
font_03_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 16080 bytes
SHA-256: 8892898f2fd90164b77b193e5d8b9f02f3124a45163e3b99bc3175d2ea1c90bc

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