Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d9d72643d8b562…

MALICIOUS

PDF

70.5 KB Created: 2021-01-18 17:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f16421f4eaa0a90a4c99ee263d84d9a1 SHA-1: cb97938a5a5711ce5ec984cc7aeeedb9e48c3868 SHA-256: d4d9d72643d8b562aee0b4a02299411da72f4f157fae3beb2e58020a9b47ed7d
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing lure or malware distribution vector. The embedded links, such as 'https://yafferge.ru/aws?utm_term=math+aids+multiplying+fractions+answers', point to known malicious redirector infrastructure. The document's structure and numerous links suggest an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=math+aids+multiplying+fractions+answers In PDF document text
    • https://cdn.sqhk.co/lelogivotosu/ijhbgcw/valkyrie_profile_lenneth_walkthrough.pdfIn PDF document text
    • http://wugafis.66ghz.com/38821979273.pdfIn PDF document text
    • http://tisiner.iblogger.org/2104209727.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464734/normal_5fcdb630e18cc.pdfIn PDF document text
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/wuliruluwosibo.pdfIn PDF document text
    • https://site-1166603.mozfiles.com/files/1166603/43594791454.pdfIn PDF document text
    • https://site-1187178.mozfiles.com/files/1187178/goluzinodevumitorawexam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455406/normal_5fa8d618ae7a5.pdfIn PDF document text
    • https://site-1179842.mozfiles.com/files/1179842/calisthenics_program.pdfIn PDF document text
    • https://cdn.sqhk.co/fazologim/uEDieji/unicorn_skin_minecraft_png.pdfIn PDF document text
    • https://site-1205734.mozfiles.com/files/1205734/ultimate_racing_history_watkins_glen.pdfIn PDF document text
    • https://site-1206652.mozfiles.com/files/1206652/material_safety_data_sheet_for_hempel_paints.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/F5A1Vie/hungry_shark_evo_sunken_objects_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444850/normal_5ff49b14e6031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofeparulofiz.rf.gd/wizena.pdfIn PDF document text
    • http://rupiroliwon.epizy.com/jikepizudurujube.pdfIn PDF document text
    • http://sarirasa.epizy.com/71977810368.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_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 5768 bytes
SHA-256: c3f9feace99d84e57c094a159c7a23f3b72084d6ee346e071b1b97a4d8edbadf
font_01_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 10092 bytes
SHA-256: 11af2ba9738891a49145c6ddce56b873b4a4cb4cbabfbe6f2814a66ea47cfcd5

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