Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd681d657b9c796…

MALICIOUS

PDF

76.8 KB Created: 2021-05-23 11:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 11853eeeda2f9f7b5a8fb189d1c3f544 SHA-1: 2fb20a7c0924e6957fa01074108b2d7c8fb0e3f9 SHA-256: 5fd681d657b9c796cb1e6ba6322791d22a040ab8d5b6b63a32e7136fc0c38f80
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://midufefew.ru/strik?utm_term=learn+javascript+visually+ivelin+demirov+pdf+download PDF link annotation
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/gadusutedeboxarida.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/wesotuxawuxubot.pdfIn PDF document text
    • https://rusigeju.weebly.com/uploads/1/3/4/5/134596119/8340655.pdfIn PDF document text
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/2986787.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/jevopemosod/losikanilukuxipan.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/68951740706.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/gafoduvigagigutegosefi.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/bewars_movie_songs_telugu_lo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c202beb-2c8a-472b-98c7-9a770f06f981/jigejib.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/lemon_sheet_cake_with_cream_cheese_icing.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/13003118191.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/sunuviguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda9b508-b378-4713-9fba-e8374c07b73c/21474122783.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/canadian_food_guide_chart_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/herbarium_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/bairava_song_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/what_stocks_did_well_in_the_2008_crash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a203a9-1e6c-4caa-969b-3e14bdfa4baf/37181017624.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/86088463362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2347ea-f6e5-438c-bf62-e8db7adec1b6/who_is_the_most_popular_character_in_attack_on_titan.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_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 5572 bytes
SHA-256: 72a21f750ec50a1131fc5afda3514c73bae5275dc6a828ca2fbaee5998c8856b
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 10940 bytes
SHA-256: ef326d2eee3fe91f81530a850c02c1378fc1b1bca553a250cb2d93deba5b9de9

Open this report in the interactive analyzer, or submit your own file for analysis.