Malicious PDF — malware analysis report

Static analysis result for SHA-256 4690d32b6a1feb8b…

MALICIOUS

PDF

93.3 KB Created: 2021-01-09 14:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 753e643da888bf9de188460322ceecf5 SHA-1: faba6c9156eb910a6585eec9af39c06010fd312f SHA-256: 4690d32b6a1feb8b8fe2ea55b0ef67afad0da0df639263e1dac759be59b1055c
222 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=overcoming+social+anxiety+worksheets In PDF document text
    • https://cdn.sqhk.co/sepovili/dgfigjg/amazon_drive_apkmirror.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/FhiibaU/zombie_apocalypse_movie.pdfIn PDF document text
    • https://reninifovebomul.weebly.com/uploads/1/3/4/3/134361606/xudufuresexo.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/jgiDCY4/loraweratudodor.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/isYhiHN/android_file_transfer_samsung_smart_switch_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/ihfReLq/takikizutuxisiwafuwotesub.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/2201977.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/suzixegazunow/maplestory_m_horntail_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/turkish_airlines_baggage_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/4937317021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3ba730-ed54-437b-9935-f16087df312d/fases_de_la_mitosis_resumidas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f62df9d-0927-4eb3-a158-7b7929db1e0c/advance_auto_parts_south_blvd_charlotte_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48726932-d820-4ed2-9cd2-43b40cf82467/luwegazerujufanepaga.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_off00013116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 5624 bytes
SHA-256: 5b5b0eea49fa475f5ebb5202d9caec3b52f07379260c7feaf13c6584d6727a6b
font_01_sfnt_off00014433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14433 10532 bytes
SHA-256: a2564c86bf5fc3767200c8b9564163c0bc78930bda95d03ac64f691c5fdbfbe4

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