Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bc5a79239f1fbd…

MALICIOUS

PDF

77.5 KB Created: 2020-11-18 23:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5fc65fc83a84c070f608a027e79fb3e SHA-1: de96a1418d9924ab8ac2c66757e72befa50c1165 SHA-256: 37bc5a79239f1fbdf05438a4a87991386f5db564577f36af49280ecfa4f2c4df
126 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 of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://trafficel.ru/strik?utm_term=smite+aim+acceleration', is presented in a way that suggests a lure, possibly related to software downloads. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm and deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://trafficel.ru/strik?utm_term=smite+aim+acceleration
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/8461528.pdf
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/4268471.pdf
    • https://sutukukibefatu.weebly.com/uploads/1/3/4/4/134486522/9109073.pdf
    • https://lumozilupive.weebly.com/uploads/1/3/4/3/134336046/jawabizago_zozedi_xepefarewevago.pdf
    • https://muvoletad.weebly.com/uploads/1/3/4/6/134642496/8a7cc1e1c30f0f.pdf
    • https://cdn-cms.f-static.net/uploads/4424645/normal_5f972c4716f4d.pdf
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/7245850.pdf
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f9e586bde1aa.pdf
    • https://lufufalab.weebly.com/uploads/1/3/4/6/134634403/nuniwaramojos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sikuva/adobe_reader_for_pc_exe.pdf
    • https://s3.amazonaws.com/bisazabe/mm2_corrupt_value.pdf
    • https://uploads.strikinglycdn.com/files/081756aa-68e4-42ae-a27d-752e19f9d6eb/52177130655.pdf
    • https://uploads.strikinglycdn.com/files/ac949cc2-2de6-4d5b-9a75-d0c8970034e8/29302149995.pdf
    • https://s3.amazonaws.com/dadupawo/user_manual_for_lg_v50_thinq.pdf
    • https://uploads.strikinglycdn.com/files/76ab2e77-21c5-46cf-b97c-9db2847ce133/92161117646.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f267.bin
6616d84933bd2745d06fb5d9e498c9eade18cd5c8f38d8edd5f020025774b7be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 4868 bytes
font_01_sfnt_off000102dd.bin
f124bf28592b563bc55e520cd76ba953be67d985e3f88d4e3a8819a60c9287bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 11072 bytes

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