Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48d2d480b4272d0…

MALICIOUS

PDF

82.0 KB Created: 2021-03-20 06:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7f64e697ff4b758a081cc62b40e6a1e4 SHA-1: 9149819f1c2c406106678af3ca8ca3fff16b2563 SHA-256: b48d2d480b4272d03420feb490bbdaeeb9521c0534d13d42151662cabf37747b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://nipisod.ru/123?utm_term=calibre+xrc+user+manual', and numerous other linked domains suggest a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and the nature of the links strongly indicate malicious intent, likely related to driving traffic or hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/123?utm_term=calibre+xrc+user+manual PDF link annotation
    • https://gisijenoxumo.weebly.com/uploads/1/3/1/4/131437849/vugezalokew.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/843a05b2.pdfIn PDF document text
    • https://paxedobopesenun.weebly.com/uploads/1/3/1/3/131398064/23c1b.pdfIn PDF document text
    • http://kewomoza.iblogger.org/statistical_demography_and_forecasting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wubexemetaxoru.epizy.com/donegan_bartell_court_reporters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e53fae-1b23-4c1d-b385-9149f1719f9c/kogufifazuna.pdfIn PDF document text
    • http://tojopoxirer.rf.gd/a-_f-_r-_o_album.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/koxuromitisajalezatiwape.pdfIn PDF document text
    • http://votarodajogagup.epizy.com/arduino_uno_software_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/nfhs_concussion_in_sports_answers.pdfIn PDF document text
    • http://mukoluduxoge.rf.gd/88000317879.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/44373253100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55e4c98-cdc0-4608-8f39-a56296413896/important_phrasal_verbs_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0bccf1-9243-4190-b846-3e59fb811962/the_stranger_author_harlan_coben.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/hatchet_fish_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/10041898309.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/migudexovavime.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/sisixanosedop.pdfIn PDF document text
    • http://giwalawap.epizy.com/eenadu_telugu_calendar_2019.pdfIn PDF document text
    • http://wegoxoxajenugol.rf.gd/xemudedubo.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/new_amendment_in_motor_vehicle_act_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/angry_birds_game_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/hat_head_fishing_report_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75495c4-543b-478c-960b-0316e9ddc30f/polk_magnifi_max_review_cnet.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_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 5056 bytes
SHA-256: de13528540033060f15413296e1c4daeba63b169a2c23e7d648c365351e220f0
font_01_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 11144 bytes
SHA-256: a06acbfd8851c2f3153735e9f48b946dc0aa158ec732edd9afe9bf86fd1d4e31

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