Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa64c3e585eca56d…

MALICIOUS

PDF

79.0 KB Created: 2021-05-13 18:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1ac127c13febe6d7085aa5bf1ee6a358 SHA-1: b76808efe34c13a4400f3454c484f92363b82c56 SHA-256: fa64c3e585eca56d3d02c095f5bed8e93cb81c87cb6544487b685f9de826adcf
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 0.9991

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
  • 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://zajinet.ru/strik?utm_term=why+is+half+value+layer+important PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474445/normal_6008ec4b86a77.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/fMMOgOq/whatsapp_messenger_software_for_laptop.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/wubosa.pdfIn PDF document text
    • https://lugifepitel.weebly.com/uploads/1/3/2/7/132710690/reremerawaw.pdfIn PDF document text
    • http://wofaguwere.iblogger.org/applications_of_brouwer_s_fixed_point_theorem.pdfIn PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/7163927.pdfIn PDF document text
    • http://dirujadejefogax.iblogger.org/balanced_scorecard_measures_that_drive_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/gc7HXjb/bucketlist_bombshells_bad_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426261/normal_6038476f3c1bc.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/i3Lji5t/23707710421.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501027/normal_60048584c4c3c.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/sLjgKvp/mivojazewuvilobavu.pdfIn PDF document text
    • https://zupedadozox.weebly.com/uploads/1/3/0/7/130738974/e2444f376548cbd.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/ciihhjf/73238491796.pdfIn PDF document text
    • http://subagibetuvipi.iblogger.org/boi_bella_vision_2020.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/fixararololu/twitch_emotes_zip.pdfIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_5abc6692329743e5ba17d53d11ac5f90.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_d61a6f69626f4df6b1823a061195c20b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/lovojifekugevusepis.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_10ff1cc3013b41e7910b5843e8d284af.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_41da6be0ba124510b8abbce76e0a9d0e.pdf?index=trueIn PDF document text
    • http://webidiwotew.epizy.com/43427417495.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/18329667186.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_1603c807a50348208590d26eea502b18.pdf?index=trueIn 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_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 5316 bytes
SHA-256: 51ed751b8c02911621d083116cf06dde7dd146cb3c6b21069dd3a28d6aead44e
font_01_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 11440 bytes
SHA-256: 540c0c51e51a1a3afdd5256bf09e7a31bac4ff34d2bfb0145d67235d2df9069d

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