Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac330298a63ca158…

MALICIOUS

PDF

79.0 KB Created: 2021-04-16 06:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 922ace0a96fb3fdba84da6dc95021830 SHA-1: dcec39750516b72be034f812902c16878575d8bf SHA-256: ac330298a63ca158881f241c9d07096bc4504425c5de4336c74613dfc989d52c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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
  • 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=how+to+get+a+penny+stock PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fe5033386ff9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5ffeb8992fc40.pdfIn PDF document text
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/631799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_5fc591c1bc597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_6050730c5172e.pdfIn PDF document text
    • https://jufasoxoko.weebly.com/uploads/1/3/5/3/135315704/velotupubag_xuvuxoxufa_rumalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_60293f1692473.pdfIn PDF document text
    • https://mesofuxemivoge.weebly.com/uploads/1/3/1/3/131398024/zakel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_ff1a79ca5ed342d1a4d41ae260561f9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/044a7a63-4a92-4d8c-bdc9-cff9b95fa12f/41681107402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9857ffc1-d0fd-4af1-bcc4-3561c11c95d8/what_was_freud_famous_for.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_f1ecdf5f82d840708974e11a0b72e34f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae731a8-29ba-4b99-bb3e-5cd11028be50/4225543183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb2de41-4f30-42af-a7a6-3fb5271000aa/wosoxeduvega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/814d0d2f-4967-4891-a684-eaea9ea84681/41967687676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4416ca72-316c-4f62-b2c2-ebad8ed68cbb/49743956821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/079be72b-c0bd-4d71-8699-991e18da6b11/viviba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fabd8e4-6141-49d4-90d6-2ecfb5a4e507/samsung_smart_tv_40_inch_price_in_kenya.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_72f9eb09b17e4a4f8da3fc67f3d2e8a4.pdf?index=trueIn PDF document text
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_10432b9af5884d3699f1456e64470702.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b71e99-242c-433b-afcf-c659863ec425/73927507853.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_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 4932 bytes
SHA-256: 3bbe95d76fe90c4239925c65fc6f32ee336b0a3085ea14a4c0d7d8f1969e2836
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 11244 bytes
SHA-256: f580da93c04e507dc9197522be8f90648310cf875685d632b79707faaeaf3e46
font_02_sfnt_off000120a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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