Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf1b7f6fe9eac05…

MALICIOUS

PDF

83.0 KB Created: 2021-01-09 15:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f2a978eb517c30a505d48261a5328591 SHA-1: d6f73afdd659ca55f058faad5be1b7c14fe560c8 SHA-256: 9cf1b7f6fe9eac054d6d825c77096b4f536448de0435aaeae4a53fa5183d6fd2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and link farms, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords that likely serve as lures to attract victims to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/wb?keyword=murder%20mystery%20game%20amazon%20prime In PDF document text
    • https://gojolukok.weebly.com/uploads/1/3/4/4/134455450/gebunurotidopetakeb.pdfIn PDF document text
    • https://cdn.sqhk.co/tajavujexiz/qge3jad/how_to_delete_viruses_on_iphone_8.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/gchj0Gt/coffin_dance_meme_button.pdfIn PDF document text
    • https://cdn.sqhk.co/nunemiziku/dha40ic/98797598992.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/gihijdy/cheap_electronic_drum_kit_australia.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/3406698.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/hc45hd6/hamilton_mixtape_rise_up_lyrics.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/petikamov/county_cricket_ground_bristol_pitch_report.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/cara_buat_cv_di_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b812f4b6-9f14-49a5-bf19-7b74f9f9a526/pezage.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/97851849289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f008de8e-6ac8-4c45-a1a7-c62ac8036a9b/bissell_powersteamer_clearview_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03be8a0-7abf-4155-8fbe-4153a973ff11/picu_hospital_austin.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/94992498151.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/splatoon_shoes_pack_gmod.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/bent_leg_deadlift_form.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_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 5404 bytes
SHA-256: 2847b825b57d1a0c90acf51fcb48d858bfc4a617746d5f5fdebc512cf49c9e26
font_01_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 11224 bytes
SHA-256: 2b4e416830600918e9206e0d13894f4f583d24d7a16c6350e7a95a4ad24c5109

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