Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece76496dc65431e…

MALICIOUS

PDF

69.6 KB Created: 2021-05-28 11:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ae53bfdcfeaa382c29c31d7a6d0cfb7 SHA-1: 8abb5de7cba8d62d04193fc82cfed59bfdd7edcf SHA-256: ece76496dc65431e5d7ba001c8dc8b6bfc2f89b1696d60635f7ec46d380cec19
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 0.9998

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://soxebez.ru/strik?utm_term=the+fisherman+fishing+planet+trophy+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409394/normal_60281549d7488.pdfIn PDF document text
    • https://nufivinob.weebly.com/uploads/1/3/4/6/134682897/tinibiweraf-besolugux-xupapewewapo-fesiredubazu.pdfIn PDF document text
    • https://xanixozejalupu.weebly.com/uploads/1/3/4/8/134873627/4196980.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387933/normal_60023636a73eb.pdfIn PDF document text
    • https://nunodovov.weebly.com/uploads/1/3/1/3/131380210/sexudiwi.pdfIn PDF document text
    • https://wadazujirala.weebly.com/uploads/1/3/4/5/134596454/726554.pdfIn PDF document text
    • https://toruruxixe.weebly.com/uploads/1/3/4/6/134698343/8716816.pdfIn PDF document text
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/sibebesazu.pdfIn PDF document text
    • https://medofigovur.weebly.com/uploads/1/3/5/3/135316586/a0073.pdfIn PDF document text
    • https://fidumozif.weebly.com/uploads/1/3/4/7/134715024/4756359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_60689746d20ac.pdfIn PDF document text
    • https://misekijenag.weebly.com/uploads/1/3/1/3/131380320/e6f5a92a8.pdfIn PDF document text
    • https://lifezubolafa.weebly.com/uploads/1/3/4/7/134715310/957d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383794/normal_5fde465f9e4b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac388a8f-8e6a-47ed-a309-0cad6f2fc23f/why_is_my_kenmore_dryer_squeaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a26d9f4-b3ec-4c7f-8a11-f363fb3a5697/57629486307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff3b1259-84f2-4750-9c5f-e037a31f5647/34274753119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b7d61e-f221-42fe-aa21-d745f5ca4a19/48459729561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1bdff7c-e73c-4235-a762-12eb282d25fd/how_to_put_together_a_dog_crate.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_off0000d032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD032 5504 bytes
SHA-256: 4acea7d50646541f6d35db62f36e7f900be66a883083331193aaa9b05bee469b
font_01_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 10620 bytes
SHA-256: f93487fd20b8b0bc9528103168b8e4052c1b58c43267c03c8aaf6a3cfa3db412

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