Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe428f274636b07…

MALICIOUS

PDF

65.1 KB Created: 2021-02-13 13:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 480f630c8dbacdf820ae0424c4c5ffc1 SHA-1: 5df6f3201dd4e7eda6477160477084f521382e4f SHA-256: 8fe428f274636b07164aba810db740c04c8b9d3c316325dcafc5d5bc549bac8a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=no+filter+band PDF link annotation
    • https://cdn.sqhk.co/xewiliwilax/gXH78NM/venezuela_socialist_dictatorship.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/Xkhgy4m/40524949240.pdfIn PDF document text
    • http://ecoservice-vlad.ru/twist_song_wapkingxoazp.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/desatorokumimamaj.pdfIn PDF document text
    • https://kujafuzepod.weebly.com/uploads/1/3/1/6/131637430/mujogufepufeverumoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/khcWety/1472289461.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/igOgcgf/inside_out_anger_costume_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/FkhbvzB/42263469.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/robubof_kirabe_firovedikonifi_vonuliligetir.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/fahLhbr/63207717298.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/salem_witch_trials_primary_sourcesggo52.pdfIn PDF document text
    • http://naturka.space/tunufejivakadikavifizobon52f5.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/TEiiSp9/imagine_learning_student_view.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixisenusadat.rf.gd/timenuv.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/93061840716.pdfIn PDF document text
    • http://dafevuzadolax.epizy.com/pillars_2_build_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/bitoguriwemi.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/free_editable_weekly_planner_template.pdfIn PDF document text
    • http://vekalaluno.epizy.com/zatabuwur.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_off0000c62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62D 4832 bytes
SHA-256: 7d304fb52a156f1a175c9c55ba8fbd3997d0650b39d919a41b3006f1d8e43244
font_01_sfnt_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 9600 bytes
SHA-256: 14d4b176d40ae91ec91e9fdfa792b8d1e9884a1f31652a5a5f813fae63a3fa0d

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