Malicious PDF — malware analysis report

Static analysis result for SHA-256 3255c675c8e55a64…

MALICIOUS

PDF

83.8 KB Created: 2021-04-04 20:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3577dbaea3573f7716539b97ab0791ec SHA-1: 22bb6a0191e3e4bf81f6d014a6517654ce0a02e5 SHA-256: 3255c675c8e55a646768f85b3a2ca7d25a415b03592db03e8da6c01e56874eb6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a "PDF_SEO_LINK_FARM" pointing to a large number of PDFs. The primary URL, "https://midufefew.ru/award?keyword=mathematical+induction+worked+examples+pdf", suggests a phishing or scam attempt by disguising malicious content as a search result. ClamAV also detected this file as "Pdf.Phishing.Trojan". No scripts were extracted, but the extensive linking and phishing indicators strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=mathematical+induction+worked+examples+pdf
    • https://cdn.sqhk.co/fobonelaga/clhgjiv/foosball_cup_world_apk_mod.pdf
    • https://cdn.sqhk.co/jatobeguji/jjge4ja/photo_editor_apple_macbook.pdf
    • https://cdn.sqhk.co/xosuridasago/Mjfhbsg/edge_lighting_not_working_note_10.pdf
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/c61e1c949.pdf
    • http://niwopofe.scienceontheweb.net/free_books_download_website.pdf
    • http://busimaderule.mywebcommunity.org/medical_laboratory_methods_and_tests.pdf
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/c79eb306624c36.pdf
    • http://spainsale.pro/baylor_academic_integrity_quiz_answersujf8r.pdf
    • https://cdn.sqhk.co/wejuladuke/jbgd9jf/cuisinart_sandwich_maker_target.pdf
    • http://optarfes.com/vetujifawukiticsd8t.pdf
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/tifufeve_wudazile_zinawisusef.pdf
    • https://vomifiwuf.weebly.com/uploads/1/3/4/8/134870299/jolafurexe.pdf
    • http://depusapo.mypressonline.com/patek.pdf
    • https://memefuzagimo.weebly.com/uploads/1/3/4/6/134612336/3fe6fbd745.pdf
    • https://jumewabob.weebly.com/uploads/1/3/0/7/130775497/3114d467.pdf
    • http://nnorm-id.com/linq_to_sql_tutorial_w3schoolspb175.pdf
    • http://powerhdniy.space/piralexiv268f.pdf
    • http://afracheat5.xyz/formation_bijoux_fantaisie_bordeaux3zbfx.pdf
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/948fc63.pdf
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/xemuxabi.pdf
    • https://cdn.sqhk.co/wenejusuzixe/h9hjdha/juguf.pdf
    • https://zefakibafiv.weebly.com/uploads/1/3/1/3/131383453/2dc031a694aa6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bajipelorisu.rf.gd/gidenivabumalazibuta.pdf
    • http://selafaveso.rf.gd/friends_anne_marie_songs.pdf
    • http://getitusedoniriv.epizy.com/jegatigosizo.pdf
    • http://wenulusevikofa.myartsonline.com/jurnal_budaya_sunda.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010777.bin
41dd997606a7a9a6f5ee5731756a1e18274eaed76a85d05eb91ef90e33a12870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 5624 bytes
font_01_sfnt_off00011a8b.bin
b76a0a4b1e20f602a4e552728b71970d43da11f85b4dd9723bcde48456f92b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 11396 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.