Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16bc49b8b451589…

MALICIOUS

PDF

82.6 KB Created: 2021-04-07 02:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5d8493824d3dfcfe0f3cfb29df9c9c32 SHA-1: b4ebb30c19070b580a1838b8349a9c92373adfd9 SHA-256: f16bc49b8b451589dcad3a5cc7bedb9ceac1272832fbb3cf5dcedfd2e843dada
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to disposable domains, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of a 'download button' heuristic further supports a malicious intent to trick users into executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/123?utm_term=purevpn+mod+apk+free PDF link annotation
    • http://probkin34.xyz/jj_smith_10_day_green_smoothie_cleanse_resultsltdx3.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/plus_one_zoology_practical_recordh93oh.pdfIn PDF document text
    • http://dutov.org/alan_walker_alone_mp4_freeeb24b.pdfIn PDF document text
    • http://good-production9.site/asana_pranayama_mudra_bandha_by_swami_satyananda_saraswatiavfcf.pdfIn PDF document text
    • http://presentinsta.site/79590544985zqoyr.pdfIn PDF document text
    • http://gatorama.site/bopajotibinesovadigesikae413d.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/adjektiv_svenska.pdfIn PDF document text
    • http://fruct.space/top_10_best_comebacks_evereg242.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/sat_december_scorev5d3z.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/lekizopiloref/edexcel_loci_and_constructions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612ea203-7555-4c33-bc87-ef1315b565af/wafatalugezunafoju.pdfIn PDF document text
    • http://lewimup.epizy.com/51378685395.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/cooks_essentials_3-qt_pressure_cooker_with_glass_lid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab0699e-89ba-4512-b1e7-56a6eb18b7f9/how_to_connect_cycleops_magnus_to_zwift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225a8f0c-008a-4203-975b-d0cc884fba1d/georgia_drivers_license_renewal_during_covid.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_f5c6d8bd0f994015aa462d1b2dc658e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falufusu/simple_budget_template_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce13aa7-0cef-457d-ba00-d98d70a5abad/zip_codes_by_county_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add5778b-a000-408a-80f0-023b868e9c30/how_to_change_best_friend_emojis_on_snapchat.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/55914612568.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/78065785982.pdfIn PDF document text
    • http://leriwegozeko.epizy.com/gantz_perfect_answer_full_movie.pdfIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_ed47ba6715494b2882e404ee1163a420.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 5104 bytes
SHA-256: 1bb955d5b1c65540a2981fa1d9ce1d820a5edcd59f4aeedbbe0b5cd21c57210b
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 11240 bytes
SHA-256: 12d295677f32f25927b47811ddd555cc45cecbbabb5262a1790b5d041aa3983c
font_02_sfnt_off0001266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073