Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ecd138cd8988c4…

MALICIOUS

PDF

90.0 KB Created: 2020-12-28 13:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b200b899145bae28008a09291dc686d2 SHA-1: 913a64f27e5e78d8247024616154e65820c3f551 SHA-256: 24ecd138cd8988c4f5160a25f3cc47f7f4b95b97ac6a82be15b2ece7ae61b174
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or SEO abuse. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://traffmen.ru/123?utm_term=eromanga+sensei+characters In PDF document text
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/sonezonuligi_posozatagusef.pdfIn PDF document text
    • https://wevoforu.weebly.com/uploads/1/3/4/5/134591306/430a16fc0c1498b.pdfIn PDF document text
    • https://jevefelenop.weebly.com/uploads/1/3/0/7/130775498/tugupopel_ratak_besobapusoxe_zaraf.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/1821719.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/bokiwesefi.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/jexusazudale.pdfIn PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/fekosutezev.pdfIn PDF document text
    • https://rixidagetowema.weebly.com/uploads/1/3/4/6/134612143/8292582.pdfIn PDF document text
    • https://zowimebewira.weebly.com/uploads/1/3/1/6/131606727/6483000.pdfIn PDF document text
    • https://jinogujejimitad.weebly.com/uploads/1/3/5/3/135392391/2643265.pdfIn PDF document text
    • https://zavegikow.weebly.com/uploads/1/3/4/8/134884987/3680151.pdfIn PDF document text
    • https://cdn.sqhk.co/lepemafe/jtSjcgh/missing_link_wrestler_hawaii.pdfIn PDF document text
    • https://buwabasowo.weebly.com/uploads/1/3/4/3/134353515/7630314.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/d03d5fc252bbb.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/novifamigot/talking_tom_app_apkpure.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 3216 bytes
SHA-256: cd263e9328ceccae90bb0f5dc89c33932775b736b1cfc37e37cfe993db4a6708
font_01_sfnt_off00012400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 5136 bytes
SHA-256: d3b9a926c558d0892db28cbdc440bdf265ba5b69ec746d0da6ea285b2fa8963f
font_02_sfnt_off0001354f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354F 11072 bytes
SHA-256: 6dddc37d6ac56b26b982a5a1294d9bcc3f87258d9ea7567c06276dc42cb49e6f

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