Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6122f9c616f6581…

MALICIOUS

PDF

94.3 KB Created: 2021-02-20 18:39:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 630c37feaaba339ef9b4f73e618ef9e7 SHA-1: a9d5b2ec68c153430a2b133714887d84b3150fc1 SHA-256: d6122f9c616f658199e9a1a93d56194561dc33f695b8eff3b146e1ba17c78529
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. One of the embedded URLs, 'https://jacksth.ru/123?utm_term=what+does+the+bible+say+about+isolation+kjv', suggests a potential phishing lure related to search queries. No scripts were extracted, but the structure and URL patterns strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=what+does+the+bible+say+about+isolation+kjv PDF link annotation
    • https://cdn.sqhk.co/marixefe/gjhjiQD/pixijukalu.pdfIn PDF document text
    • https://tugufotekaluxaz.weebly.com/uploads/1/3/4/8/134883762/mixusulud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_60261b7dd3513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_6019d93c47d86.pdfIn PDF document text
    • http://dizewut.22web.org/persuade_inform_entertain_describe.pdfIn PDF document text
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/5067658.pdfIn PDF document text
    • https://cdn.sqhk.co/sizebadit/fwjaheQ/jet_hd_music_player_plus_apk.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/zegoj.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/winuvadamovow-jafowa-kefiva.pdfIn PDF document text
    • https://bajumavo.weebly.com/uploads/1/3/4/4/134486103/1c69128d21732.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/heDhg1F/94456828972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5fdbd5a5351eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_602f5b904e9d8.pdfIn PDF document text
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/5929355.pdfIn PDF document text
    • https://weligolujevis.weebly.com/uploads/1/3/4/7/134748453/6252947.pdfIn PDF document text
    • https://bojuwidus.weebly.com/uploads/1/3/4/6/134698781/66351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481988/normal_5fcbddc757976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelasezota.rf.gd/logoputi.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_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 5272 bytes
SHA-256: e2c50818127a44a8f17a23e85e40880470cf5d1a1755bb45dce4c37148a9111a
font_01_sfnt_off00014635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14635 11364 bytes
SHA-256: f90f5929d4243a5b18afdd2da1c1dba22f4c5bcb143f3e1ce2a8751dc4f5518a

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