Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6328dc15a891ef…

MALICIOUS

PDF

78.2 KB Created: 2021-03-18 05:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e90a66283d6768884cd596cda5c5e377 SHA-1: 0e006856bd5fa17eec23a911abc978cea3e915bc SHA-256: 2e6328dc15a891ef04ef5d85cbf8d4930397f2b7a9d9d3ea88f6ceb9bd5e8f1b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'cover letter structure template' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=cover+letter+structure+template PDF link annotation
    • http://zujuzerawijuk.medianewsonline.com/la_cantatrice_chauve_ionesco.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/how_to_change_the_battery_on_an_ipod_nano_4th_generation.pdfIn PDF document text
    • http://tanijosek.22web.org/jonafijal.pdfIn PDF document text
    • http://buvevolu.iblogger.org/auto_loan_calculator_excel_sheet.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/mebelixenoga.pdfIn PDF document text
    • http://lerasusakibura.22web.org/fire_emblem_heroes_merge_allies_guide.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/sexazotitefip-kelugumaram.pdfIn PDF document text
    • http://terasivox.22web.org/soul_music_70_s_free.pdfIn PDF document text
    • https://kemipopebu.weebly.com/uploads/1/3/4/5/134585234/vimudolo.pdfIn PDF document text
    • https://tutamedu.weebly.com/uploads/1/3/1/8/131856186/kobariwilerolu_pirujotuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38634ba-f089-4153-b3fb-77e2c4ad921f/my_school_life_essay_for_class_2.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/48959851399.pdfIn PDF document text
    • http://nikibalanijesaf.rf.gd/lagu_band_maid_choose_me.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/rarotedupagofenijanawom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b003b8-7afd-48ab-891d-e42e100fc34e/accelerated_reader_lexile_conversion_chart.pdfIn PDF document text
    • http://palakojum.rf.gd/zibak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/971c3a35-37a1-4f3f-98f8-0b6b3f3ffc71/73893632561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99168039-9b04-48a0-b6de-941ad50de632/d-link_dir-825_g1_firmware_download.pdfIn PDF document text
    • http://jofesosozofoso.epizy.com/96152206226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15ef4cf-e3e7-4952-84d8-b04020a700c9/highway_safety_ratings_minivans.pdfIn PDF document text
    • http://tedowok.epizy.com/jexenuraxejikoxuluzonazo.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_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 5044 bytes
SHA-256: 70dbd7092d86480fa45c4ae7151ac58638c56966cb883a7cb33a2d825ed7adcc
font_01_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 10732 bytes
SHA-256: 46546fba36c201ff759d7b4ed494263b3628158d93b7e029672442351aceab31

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