Malicious PDF — malware analysis report

Static analysis result for SHA-256 5062e66b14218fd7…

MALICIOUS

PDF

73.4 KB Created: 2021-06-11 17:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 93b3d93d053b24c6f5003da4126929fe SHA-1: e926857f53e7a90f5f60f5f619a2c0eac233d425 SHA-256: 5062e66b14218fd77886ce91f9c726283a7c0dac0dfb9670f3cbb9a70763bb5e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains, a common tactic for SEO manipulation or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://queure.ru/pbw?utm_term=chinese+link+character+book+pdf PDF link annotation
    • https://juvezunadu.weebly.com/uploads/1/3/5/3/135306862/kuzitojutofukude.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480589/normal_60092d2e23d68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_6069fece24d9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5ff128b127b11.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4458122/normal_60afff90500ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_605a60895f597.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450044/normal_60b005604f8c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5ffd89649764d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_6050f8e5b8935.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465905/normal_5fe2559673662.pdfIn PDF document text
    • https://xugosutul.weebly.com/uploads/1/3/4/4/134446405/40c9475a77.pdfIn PDF document text
    • https://tiketarutuluvo.weebly.com/uploads/1/3/4/0/134042831/zulewekubawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487424/normal_6055ba967711f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuxanoguk.pbworks.com/w/file/fetch/145119642/chemical_principles_zumdahl_8th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6f35f4-17ee-4789-97c8-46845a2f85c2/baofeng_uv5ra_programming_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc76c103-a3af-4860-9890-2cb5dffeb4c7/wowujevulosap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc05aa7d-01aa-45a9-b930-ae9cc8873536/descargar_yu_gi_oh_power_of_chaos_kaiba_the_revenge_espaol_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4362c90-1d75-4402-8811-735b4afa7f0e/how_do_you_adjust_the_pressure_switch_on_a_husky_air_compressor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b718936c-2760-44c1-bd29-f57933b4357d/39587136918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b7369e-c7e5-45b9-a34e-49d5a1c6c01a/good_time_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad501bc-da2c-4a92-8f9b-1119126c5b4c/6477802083.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/w/file/fetch/144539976/41846426718.pdfIn PDF document text
    • http://zulamiz.pbworks.com/w/file/fetch/144888186/weathering_with_you_movie_download_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d461b5-d412-4d03-bc76-d9476513ae00/what_do_i_need_to_start_using_my_cricut_explore_air_2.pdfIn PDF document text
    • http://tosixuze.pbworks.com/f/mawenikarukabidewe.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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 5352 bytes
SHA-256: 60307a24dec1132f2415cd79ce9b406066953db56318affa22ee1eb0cc50d4b7
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 10972 bytes
SHA-256: 79da28f27d5f1c2db7891684a945f29989f0c10aeffbc2982c9adc85eedac5c5

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