Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16557a153aa565d…

MALICIOUS

PDF

94.2 KB Created: 2021-03-06 03:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ef814b08441bb2d91bd35b866079e976 SHA-1: dea1f24e6ceace1344cc71771a7c67c8b02ee891 SHA-256: c16557a153aa565d61e4791707ce895b3768f325e66c5bfc576193fb0d590f36
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing operation. The embedded document body, though heavily obfuscated, contains a search query that likely serves as a pretext to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=what+brand+of+creamer+does+dunkin+donuts+use PDF link annotation
    • http://gexomafe.mypressonline.com/kenmore_80_series_stopped_working.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/25193083030.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/45149065153.pdfIn PDF document text
    • https://tikigafose.weebly.com/uploads/1/3/0/8/130874564/0f4744346f.pdfIn PDF document text
    • https://rujurujubawupof.weebly.com/uploads/1/3/0/9/130969172/f6c1267281.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/mukut/bekhayali_song_lyrics_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/atom_reformat_code_shortcut.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/27998077219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed592e5-bd01-4120-9751-d6a08a219b77/75567117369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98437704-4c00-4151-ab26-ed962ae19ca2/42322250616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2861add0-b9c9-4cbc-8f4f-f486733ea9a2/voyager_legend_uc.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/79175281109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f263c488-b15e-4e87-9b74-90c754cca441/north_carolina_career_and_technical_education_essential_standards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f55043c-73d0-4fb9-9500-cadd3df99815/what_is_the_culture_of_ancient_greece.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace53a9c-9d87-4121-92e2-dd8b82bee95a/50455377737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc4491e-dfff-4e72-b731-d0013747bb8e/why_is_newspeak_important_in_1984.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/me_before_you_full_movie_download_in_hindi_300mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be5e286-0753-44e5-9674-dc5428acffee/74939143798.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/81727152528.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/extent_report_using_cucumber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1f4aab-f682-416c-930f-de7ab41ff7c0/washington_dc_map_metro_overlay.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_off000131ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 5448 bytes
SHA-256: 7e019ba77c5ea78234d1841e8bc00e601a29239c45157e5c76b1cfaab48bbd5c
font_01_sfnt_off00014435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14435 11612 bytes
SHA-256: e3ac06be761575d4707cd626db206d7619881e31a91b5a4c7aaae2d875fe32dc

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