Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af886ee589aa36d…

MALICIOUS

PDF

78.9 KB Created: 2021-05-26 07:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6514683c536674d9c06df0af60c98da2 SHA-1: 5319d2f3e4c3aaa72be52500e9c4c20e3ae1e6a1 SHA-256: 7af886ee589aa36d21fdf95baf6dba28216de12abd64044da35736b81cfb6a04
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://botokaw.ru/strik?utm_term=calligraphy+font+free+photoshop PDF link annotation
    • https://wufanamokedig.weebly.com/uploads/1/3/5/3/135326106/datiludekomod.pdfIn PDF document text
    • https://nefopenexa.weebly.com/uploads/1/3/0/7/130739549/7878152.pdfIn PDF document text
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/wazubawune_jomaperizarut_bovipofaz.pdfIn PDF document text
    • https://bufekebutejef.weebly.com/uploads/1/3/1/8/131856184/lobowitotemaveg_bujuzoz.pdfIn PDF document text
    • https://wimekigulaz.weebly.com/uploads/1/3/1/1/131163744/bonezazotegavaj.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/d46a3bb32daf7ef.pdfIn PDF document text
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/5074112.pdfIn PDF document text
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/2d1cb85f.pdfIn PDF document text
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/2e63dcbee4021a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5fd8f51f72d15.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/simitisejujalini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_601c885f96dc6.pdfIn PDF document text
    • https://lewagezu.weebly.com/uploads/1/3/4/3/134369469/5958399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5fe72f0638b7e.pdfIn PDF document text
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/9725746.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/ronenitevodo/76949715389.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/37574136453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2688ee-89c8-47f6-b608-17148062e9ee/ginikafewuwefikasis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c7e257a-b7c4-4943-bed8-e8538908d676/boss_tu-2_bypass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4274ece4-d92c-471d-bd60-c524398efa00/review_resound_preza.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/sebepinubojavumutakugixi.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_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 5172 bytes
SHA-256: b0fab60cd784f9864c418d06e279fc16c13d67e30b6aa34601cc0e3a1f765ad7
font_01_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 11260 bytes
SHA-256: c9ac0d57c947d0396e30df1182c98ed92a1eb08045517216165d08234b961d67

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