Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f4854e1159caba…

MALICIOUS

PDF

71.4 KB Created: 2021-03-21 03:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3ede24a40e22a64ef0df5d9548b34c01 SHA-1: eb192e3442732b8792534ad82ab75ae37243d0d1 SHA-256: 80f4854e1159caba152b5ae416da5b2684c638c8dfab105c6745f72c8de95cf6
186 Risk Score

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 designed for SEO manipulation or malware distribution. ClamAV and ML classifiers strongly indicate maliciousness, with the document body suggesting a lure related to educational materials. The embedded URLs and the PDF structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/wix?keyword=slogans+worksheet+ks2 PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://kibidabusiben.weebly.com/uploads/1/3/1/0/131070702/ronivofesopuz.pdfIn PDF document text
    • https://tajezutudod.weebly.com/uploads/1/3/1/3/131398094/5072068.pdfIn PDF document text
    • http://naturebiolog.space/letter_template_applying_for_jobamcb3.pdfIn PDF document text
    • http://medyahanem.com/stone_blasting_powderwckhc.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/pSYcig2/human_physiology_by_sembulingam_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/mifhbhd/jumisivulune.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/h6gcmCg/shooter_games_online.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/dijuv.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/hdcijii/fiwenesedovumupezuva.pdfIn PDF document text
    • http://ses-paypal.com/les_mis_songs_with_lyrics_youtube731ca.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/hdmASij/2430636665.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/QANAxhd/89814446824.pdfIn PDF document text
    • http://reweder.site/41410102351ze1fu.pdfIn PDF document text
    • https://cdn.sqhk.co/gadadanilos/ijKjhhg/kalufexa.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/bejezoxetad.pdfIn PDF document text
    • http://verifiedbadges-form.com/vikevobipewivitkvsyq.pdfIn PDF document text
    • http://sbrf.link/java_swing_tutorial_intellij_ideaqoii4.pdfIn PDF document text
    • http://gatorama.fun/how_to_use_thermador_speed_ovenr5ioq.pdfIn PDF document text
    • http://joy-todays.online/ap_us_history_course_description_guideib7z6.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/bigdggj/air_xonix_3d_game_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_da0e4eeb37ca4b1c905f89a2b81371a7.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_c07d01b3709d4847a1256d300f2c6801.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_9a2198838373494fba271872105298be.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_4b07e4118fcd442ba7fb3a4d7a927386.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_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 5336 bytes
SHA-256: 84076f0792e343611e2d9fd4d14f5e835ce1e4423c5ecd430e0a20e90b8a4dc1
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 9936 bytes
SHA-256: cdf5c059842b98b1189ffcf2d1a4a2d2bb052da8a55edcd9aeba325b8d1e7266