Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb21b50a41f1ce67…

MALICIOUS

PDF

165.0 KB Created: 2021-03-18 09:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: dd2431ec1e8ed0aa9065451c9cd45c6f SHA-1: 55e83a578a7f898bb504fde590bf4926f7821945 SHA-256: cb21b50a41f1ce6700466c11ccf8d4e5b4220ef578ca26a6457856a9b4527077
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Protozoa the protists worksheet answers', indicating a phishing or malware distribution attempt. The presence of external URIs and the link farm heuristic strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://leonvi.ru/wix?keyword=protozoa+the+protists+worksheet+answers PDF link annotation
    • http://forovasax.medianewsonline.com/timaxokusedejiwojojiloti.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/jGAiaPH/jett_challenge_foosball_table.pdfIn PDF document text
    • http://wozuxel.getenjoyment.net/sepudawifam.pdfIn PDF document text
    • http://tewosube.mypressonline.com/13434591351.pdfIn PDF document text
    • http://retamos.mygamesonline.org/reviving_ophelia_movie_review.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/how_to_pair_photive_bluetooth_headphones.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/ijgfFjj/down_the_mountain_lyrics_robinella.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/zWlhf2e/xijegevunedoka.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/7jcihjc/50374000182.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuxilav/qhhhfcr/belt_sander_or_sheet_sander.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/figozorolide.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/kogedigosekazolojupebot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5e2a623f-964e-4a26-8b59-fcdd7c2525d9/libojumojutanisunib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70563780-0491-42b3-84cb-19da6a5461cf/kefuresapolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e3a2eb1-4d27-476e-a2c2-79a0a2f9cb87/thomas_harris_silence_of_the_lambs_book_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4930e2-db24-46f1-a5f4-c32d6843cb72/tabla_periodica_nacionalidades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ab6ed7-be79-40b4-a56a-0cb189a4417a/night_shift_commodores_lyrics_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d11386-d1b3-49d7-bc30-c916c8b54d0d/ukulele_for_dummies_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629bcafb-b17a-4281-a0af-8119603aee1c/what_are_all_the_negative_emotions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774be78b-f077-4686-83bd-a7f594ee85b7/91391576116.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/applied_physics_mcqs_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db83a63f-db3b-47cc-99be-159a74d38bba/vasogipojonem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09cbd05d-a99d-493d-ad94-f88cfac397f5/how_to_use_imovie_9_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c6f7db-f211-4805-9619-27ecdaa8a6e2/the_true_grimoire.pdfIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2117D 6188 bytes
SHA-256: e80ac3e078a6312b43bf9c88c6e6ca8788f4382f1c63950ccc9fabf8ba325898
font_01_sfnt_off0002269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2269E 4872 bytes
SHA-256: 68e254e31536ce02072bc2084aded39fb6f590a94e05d3b3fb8a3ffb1283ebf7
font_02_sfnt_off0002372f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2372F 12968 bytes
SHA-256: 94a82c40968c0223257e249ba48e4c40c1a6bbc3d9e2a47ea10b3709ca11acaf
font_03_sfnt_off000261fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x261FE 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
font_04_sfnt_off00027695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27695 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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