Malicious PDF — malware analysis report

Static analysis result for SHA-256 134874883b256128…

MALICIOUS

PDF

77.4 KB Created: 2021-03-06 12:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6a2215343f815485f8b17efe81f2bf00 SHA-1: 6ada32a4a7979011a89b469e4974d1f77f7b7229 SHA-256: 134874883b256128c56c82eff9a3c93b3c75ecc9a1b744d967981826a4a5eb6b
244 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=plantronics+voyager+5200+uc+pairing In PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/xowebomusi-sogijetomikom-tezusexa.pdfIn PDF document text
    • http://cheatyou.site/917743550441ahx0.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/tMigMhj/iowa_duck_hunting_2019.pdfIn PDF document text
    • http://4338bacchus.com/801429177252qvcb.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/gilekuno-mujax.pdfIn PDF document text
    • https://gexuguxibam.weebly.com/uploads/1/3/2/6/132696321/2898884.pdfIn PDF document text
    • http://sosed.market/how_many_books_are_in_the_shatter_me_series_in_orderfsf8r.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/visuwaba_vepakokerakabo.pdfIn PDF document text
    • http://my-favshopd.online/28618066631jgtum.pdfIn PDF document text
    • https://jowetetezuvam.weebly.com/uploads/1/3/4/7/134717416/fetosizofiteza.pdfIn PDF document text
    • http://vipadminler.org/mr_bechara_songsubg7.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/hbiaqii/my_airtel_tv_app_free_data.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b408e22-73cf-4262-b02c-0308e9d0dda4/best_electrician_trade_schools_near_me.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_56de2b152da74486b1e4c89278ecfd78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/pixulewun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df04a1b-5366-43eb-b63e-35f93e825c39/which_veg_are_high_in_protein.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_645e1584cc19472da640335b63c48395.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be49f5aa-97b4-452e-aa79-f8a08715eb14/do_flammable_storage_cabinets_have_to_be_grounded.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_0309669bbded4e0f88df4f9d417dee85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/antique_scroll_powerpoint_template.pdfIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_7de5d97974074d3cb241e9910ec0e438.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_bb752597d36545959cfd4551c0444511.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_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 5664 bytes
SHA-256: 775a5237987214e50fc2908a12db7e8f37b85b6cb6d946d87a0c6c51659a1392
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 10904 bytes
SHA-256: 6c1eec96e2b2edc08b53a3166db61cdd4abb9527adcdaf6c910f486d3973641e