Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4abf2106abf390…

MALICIOUS

PDF

78.9 KB Created: 2021-02-13 21:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6262ce9dc01f6d17091fb47db56e499b SHA-1: c5a873e41c4d29b16b835a29f5aeaba91a7cf68a SHA-256: 6d4abf2106abf390522397e9556711ab43da7372459898d762f41f8d12b33bfe
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, identified as malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, potentially for credential harvesting or further payload delivery.

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/wb?keyword=fema%20is%20240%20leadership%20and%20influence%20answers In PDF document text
    • http://deteluwo.iblogger.org/canadian_election_platforms_comparison_2019.pdfIn PDF document text
    • http://gufutaca3.xyz/daily_routine_speaking_activities_esta3s3.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/zulux.pdfIn PDF document text
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/mupole_webapufuxuba.pdfIn PDF document text
    • http://donbetosstreettacos.com/reading_comprehension_about_food_for_beginnersxpof5.pdfIn PDF document text
    • http://copriyghtconfirmed.com/20563287347eqt39.pdfIn PDF document text
    • http://uber-global.com/nirewigosusuwgpak5.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/7578394.pdfIn PDF document text
    • http://teren.fun/6952702787qk3zp.pdfIn PDF document text
    • http://kijorifoweb.22web.org/alesis_dm10_x_manual.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
    • http://fojupejededoto.epizy.com/26642088392.pdfIn PDF document text
    • http://pixagikaw.epizy.com/soxidetokined.pdfIn PDF document text
    • http://direpedokelazal.rf.gd/civilization_6_religious_victory_guide.pdfIn PDF document text
    • http://zolatororulukod.epizy.com/colour_by_numbers_addition_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/womijunitob.pdfIn PDF document text
    • http://wasuwenakab.epizy.com/avanza_2013_putih_manual.pdfIn PDF document text
    • http://lesasesodimavun.epizy.com/desagerefarixas.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_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 5496 bytes
SHA-256: 9b34801406ef0d2c0e6d0bd7a1529cf9ecbf85d63ccdcac1ef6ea6bca12304f8
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10844 bytes
SHA-256: 460688b4e9395c56bc347f1beb3f0136c512c01d763399448a9caf0c7639bf6d
font_02_sfnt_off00012065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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