Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5b08e818aad5c6…

MALICIOUS

PDF

91.4 KB Created: 2021-04-11 22:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 31a3f6b7720d894f20c49961bd468672 SHA-1: 59a4c824e1b10e694501396d2c398f026a8c5714 SHA-256: 7b5b08e818aad5c6950dd6e2eaa546281a9567539598443bb55f7a8f58b694ae
186 Risk Score

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 0.9989

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://druttle.ru/strik?utm_term=how+to+use+layers+in+photoshop+cc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fc841f74653f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_6010ac197ec5f.pdfIn PDF document text
    • https://kojozoxilasa.weebly.com/uploads/1/3/5/3/135302893/2974195.pdfIn PDF document text
    • https://medabuxizuf.weebly.com/uploads/1/3/4/3/134383904/zutatobumixig_sodokawejefoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_606e6e4d36874.pdfIn PDF document text
    • https://gobajirosalafos.weebly.com/uploads/1/3/5/3/135392744/5477973.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/1194309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392651/normal_6008fd73d31e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463308/normal_6031019c11dc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5fc6f225a3741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_6024287c84779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_602d6799dd53e.pdfIn PDF document text
    • https://nenafusorez.weebly.com/uploads/1/3/1/4/131453248/wonid-gonat-sipijemutot-xulipuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_601d707a912c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_605f839e28fd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_606948fde0458.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://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_dc2e232b93294fabb982b02046156ad2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d3d827-1de0-4122-892e-df502a64e892/oster_food_dehydrator_trays.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_315051520a9d41128ec8a73ce5b5ea4e.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_0661134ebf6b4ba1925847136678a6f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24aad800-cc9b-4364-a56c-1b6a2054bf8a/fifap.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_334c2dc45d7b415fb07e605395840ed5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97948369-7262-441f-b069-851281b85ffb/54053069385.pdfIn PDF document text
    • https://f3215690-35ba-4bce-915f-db1a6f912a1b.filesusr.com/ugd/d32599_54c2f45aeeaf40188844b80b7e783f9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d804bb4-c6ad-4a1b-b6ae-d7e28810f279/sejakawifikowitopavilub.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_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 5060 bytes
SHA-256: 031043f0fa034e823e2b0841cea1ca53e491b6b028d615306304c7512d029fbe
font_01_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 10204 bytes
SHA-256: 9e8a02cae1822ae83be9277eb265fcffa68975b278b4c0d120478f236c4f8756
font_02_sfnt_off00015184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15184 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230