Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cad4e02233f4c2…

MALICIOUS

PDF

74.5 KB Created: 2021-03-17 23:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b9a251f2a884f1942840514de268bd5 SHA-1: b01d30b6f236e9d1e17fff4420d470cd48da5ce9 SHA-256: a9cad4e02233f4c2e7af721dcd79a56b88569539061cc29b84e1316d74f6cf2c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect users to malicious or phishing sites.

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
  • 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://nipisod.ru/strik?utm_term=roles+and+responsibilities+of+test+lead+in+agile PDF link annotation
    • http://goldenframecollision.com/present_perfect_exercises_esl_worksheetxsulb.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/how_do_i_program_my_toshiba_ct_90302_remoteymao3.pdfIn PDF document text
    • http://discount50it.pro/livadurafew6hy2p.pdfIn PDF document text
    • http://nikecortez.net/wiselitcmah7.pdfIn PDF document text
    • https://kutinimi.weebly.com/uploads/1/3/4/6/134608846/5307704.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/ca7b4.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/7645725.pdfIn PDF document text
    • http://shop-kid-toys.online/19101696067mo7iz.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/tufafivorapud.pdfIn PDF document text
    • https://sabumamopadav.weebly.com/uploads/1/3/5/9/135957329/dafepagobap_sidavise.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/7199229.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_7e120f49e9ba4a6d85c715cd0523bb4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b4b74b-e725-4014-9c47-9d3904f7646a/play_script_format_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c8004b-a04a-4afe-9e80-83a66650884c/cialdini_influence_science_and_practice_summary.pdfIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_e8fec15859ba49938158f4e217fc9935.pdf?index=trueIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_bd1ff5c3c1d540269ae3dec00e61642c.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_eec228535eb9472e8607857f2ad0626b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c40e16b-3eae-4110-b466-683bc00c7613/what_does_strength_training_mean.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_2fe68a0d1afb47608e61718b42cdf5fe.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_2998b2eaad904efe8c6458c525f07ba2.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_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 5356 bytes
SHA-256: 28037c986e6d63e57eb2f768bba2d8d2fcdfa752916b684389890f026c7e074a
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 10644 bytes
SHA-256: cfa5b5bea0ea6d45ec747508150feaa74b45dc1883eb0b170c61718d71970a84

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