Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c494ab4efa6afb3…

MALICIOUS

PDF

86.6 KB Created: 2021-06-08 21:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7bc3f0a96a88ff6e8ab52be964ceaaa1 SHA-1: 1d4cf706a312d8804cced86c9f6b0225937c8c6b SHA-256: 7c494ab4efa6afb3a09f3ab91d1e57776546f85ee74212c4c78df9a7cff4cb0c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://chcial.ru/pbw?utm_term=bold+3d+text+effect+psd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5fdf27d109039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_6024fa224ed4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_602fb6004d392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469365/normal_5fdada58c24da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444351/normal_606410432d912.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410730/normal_5ffa104487063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_5fdb2c144accd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_6041b2b587bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_600fcb1051903.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4384155/normal_60b3b49c9dc00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144456585/how_to_program_genie_blue_max_garage_door.pdfIn PDF document text
    • http://xotokuwawa.pbworks.com/f/kebedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfca386c-82a3-471f-be04-8cc0e4d16386/valenomupibikidulolireso.pdfIn PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/144474537/23672124994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08b8aba-fa35-49b9-b023-73f99178d5bb/beko_washing_machine_not_draining_or_spinning.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144482631/73007347087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc274f9-94ab-4056-88c5-70ccbc820ebe/kung_pow_2_tongue_of_fury_streaming_ita.pdfIn PDF document text
    • http://bamedun.pbworks.com/w/file/fetch/144631413/harley_davidson_electra_glide_trike_kits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2003f7a-4027-45dc-a1e9-0aaecdb5ab31/21356442722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1058851c-c09d-4436-98d3-1f9b48bb678a/nunukoveren.pdfIn PDF document text
    • http://nomebazeregi.pbworks.com/w/file/fetch/144740580/what_is_first_order_and_second_order_analysis.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/f/sebeleda.pdfIn PDF document text
    • http://rajejor.pbworks.com/f/how_to_find_voltage_regulation_in_transformer.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/f/descargar_geometry_dash_2.2_apk_para_pc_windows_10.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_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 5124 bytes
SHA-256: b7d5ba5719fb6fd11760c9282c27ff3713d5d4c8d45475b3f483c5afd8f56435
font_01_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 11072 bytes
SHA-256: 8192f780a2d938a79e0635b15dcbb09fc5c31ca0c68f63e45db4b48df8f1fd01

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