Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe63a8c2105a3c7…

MALICIOUS

PDF

76.3 KB Created: 2021-05-23 01:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 034533a6f3f055bf97e3cf2597ad9188 SHA-1: 82e608ba88be176a396d7efeb01467edc7b3faef SHA-256: abe63a8c2105a3c72b3bfaa79e90ce8249356291bfdb633858a10cad6417d1be
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to various PDF documents. One prominent URL, 'https://dafemum.ru/strik?utm_term=metric+dowel+pin+sizes+chart+pdf', is directly embedded and likely serves as the primary lure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://dafemum.ru/strik?utm_term=metric+dowel+pin+sizes+chart+pdf PDF link annotation
    • https://bivolureru.weebly.com/uploads/1/3/4/5/134583024/sowusesure-govinaxuraja.pdfIn PDF document text
    • https://fogepiwutakeru.weebly.com/uploads/1/3/2/3/132302718/e0bf44bc06a.pdfIn PDF document text
    • https://kapiromus.weebly.com/uploads/1/3/5/3/135345701/ebce4691758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_5fed1451bafc6.pdfIn PDF document text
    • https://vurusewotuludi.weebly.com/uploads/1/3/0/7/130739344/baris-gobilikefixor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_5fd792009722d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nokiva/74713956218.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/fewogofi.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/pifubatosatisajefobulogup.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/bopif.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/tres_metros_sobre_el_cielo_3_film_online_subtitrat_in_romana.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/changing_the_subject_psychology_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e005ec-26d8-4290-89e0-f438213558f1/20199317666.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/place_value_games_online_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/english_test_store_net_online.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/diy_shark_steam_cleaner_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3290e2-4b4b-4131-b354-64f4aa1c4c93/the_rising_of_the_shield_hero_episodes_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/why_do_you_want_to_marry_your_wife.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/innisfil_weather_report_hourly.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/tesoforifojerawinememutif.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/7185463783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25715a9-16f1-4151-94d5-0421cb8e1438/xaxizodidugiga.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/xofiki.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/69969302674.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_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 5388 bytes
SHA-256: 31358a87c94500ea230e6fe74b0347c3d15ba363ec317351f19d2d14d7406df9
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 10272 bytes
SHA-256: 8758df893c9f3afa5a24611ab5cfebbf5984e16463ed76a06c8474b689fe23b7

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