Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4b7b868c18cfae…

MALICIOUS

PDF

81.3 KB Created: 2021-04-03 15:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1e0d2658c1b42455e94f47eb651a17d9 SHA-1: 9339ab3ef3b1dacd6d19e9831132e0a50a516090 SHA-256: 2c4b7b868c18cfaecaa798338881aae58e5fc08675907759d2f7e61aa4cfdcd4
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which are identified as malicious redirectors or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm and the malicious redirector URL suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=dexter+t400+washer+for+sale In PDF document text
    • https://kabibejago.weebly.com/uploads/1/3/6/0/136050231/nixujap.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/Rgigcig/fofaregorim.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/VVjgqa5/mixanurepirideboguj.pdfIn PDF document text
    • http://jigunemav.22web.org/2402033323.pdfIn PDF document text
    • http://nofixeb.iblogger.org/nedakileniw.pdfIn PDF document text
    • https://virubavu.weebly.com/uploads/1/3/4/7/134755547/guzakes.pdfIn PDF document text
    • https://rewusimivizegan.weebly.com/uploads/1/3/4/5/134578415/9fa52fb9a1.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/tidaluzob.pdfIn PDF document text
    • https://cdn.sqhk.co/vafizolubev/gfOigBF/android_guideline_java._lang._assertionerror_left.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zutezirupatot.rf.gd/61993623141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afd1154-6cab-44f8-bc04-9f12d7833289/convert_amazon_kindle_to_online.pdfIn PDF document text
    • http://mimubokufalow.rf.gd/69621091679.pdfIn PDF document text
    • http://nojorate.rf.gd/online_converter_jpg_to_with_merge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf10ad55-a610-45c3-9be6-79e8edfa31b0/ibps_clerk_exam_sample_questions_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f9b082-3927-4590-be6c-d8b8ec33a9bd/69055039662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645a8cb9-5732-4cb0-94ba-15bd77b543f5/the_pricing_of_options_and_corporate_liabilities_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c742604-3b05-4a29-9cb7-657ca207da8d/we_the_kings_sad_song_piano_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22db025d-627d-41ea-9579-860817580f4c/sony_action_cam_hdr-as200vr_instrukcja_obsugi.pdfIn PDF document text
    • http://dunizolosonon.rf.gd/22099691762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80259d25-5750-4ba2-9e3a-a18b7f9c7213/what_are_the_major_geographical_regions_landforms_and_bodies_of_water_in_canada.pdfIn PDF document text
    • http://xowupetakesa.rf.gd/fuvevezilolaganaxafus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 4880 bytes
SHA-256: 74474a3d3109a29eb4aec25dcc111203a43a9b3ef469f439bdbe2ce1026b247f
font_01_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 11868 bytes
SHA-256: 038b0fa731d2ea9ce0769239a1a115f86dae59ed5fc1f81aad82936b5de55f6e
font_02_sfnt_off00012a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A07 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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