Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f5263b287bde24…

MALICIOUS

PDF

88.9 KB Created: 2020-12-21 19:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed475405a01f767296d9f4a2fa799083 SHA-1: 1d05433c28c90535cd5c391b26fb6d4f89c42541 SHA-256: 28f5263b287bde24a725ef7698b4bab9748d57fae7d203fe6adf94b1dffc410f
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/aws?utm_term=philippine+financial+reporting+standards+meaning'. Additionally, it features a PDF link farm heuristic, indicating an attempt to distribute or link to numerous other PDFs, with 'https://s3.amazonaws.com/susopuzupure/sugonudowap.pdf' being one of the identified links. The ML classifier and ClamAV also flagged this PDF as malicious, strongly suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=philippine+financial+reporting+standards+meaning
    • https://fejajeger.weebly.com/uploads/1/3/4/6/134614243/4797a0fd.pdf
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/gifewurikex.pdf
    • https://jodotabamusunew.weebly.com/uploads/1/3/4/4/134402052/bea175127.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/susopuzupure/sugonudowap.pdf
    • https://static1.squarespace.com/static/5fc77c1543c5ee75bf2c7b30/t/5fd18bacae71ea6dd31880f3/1607568303140/sivalotojizobunevid.pdf
    • https://s3.amazonaws.com/davawina/18225814875.pdf
    • https://s3.amazonaws.com/jemisajoda/nejevabeninivokikebusenus.pdf
    • https://static1.squarespace.com/static/5fc0c48c104edf1d778017d3/t/5fc147c7cb3e0f57717e9a6a/1606502343798/wayzata_school_district_boundaries.pdf
    • https://static1.squarespace.com/static/5fc78acea4492a057e240f0a/t/5fcb668b8dcc5603bef34580/1607165580448/dragon_city_chinese_menu_rushden.pdf
    • https://static1.squarespace.com/static/5fc66f6492c50b1a1e9d5f03/t/5fd12ecbe1245a2b671672eb/1607544524679/electric_train_uses.pdf
    • https://static1.squarespace.com/static/5fc3647d6609fd0ee7a157c3/t/5fc6801df81c9a2a0c854498/1606844455041/how_to_spell_snowball_fight_in_spanish.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2a8aeaf37e3b64656699/1606298253056/heathers_the_musical_full_script_free_download.pdf
    • https://static1.squarespace.com/static/5fdd2afa6394b41d6424bc80/t/5fdda9d0f3f88b619ff9ff74/1608362448145/rosupipurobakavu.pdf
    • https://static1.squarespace.com/static/5fc565982e537a05ef2721af/t/5fcc83d0cded405bb8d211e4/1607238609942/the_galactic_emperor_2020_trailer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001100b.bin
dfced056ca8e9b1f1c53307b3f151ae570e06f6a75091970712b99bfbb5024ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 5356 bytes
font_01_sfnt_off00012204.bin
1b6585ff4e82c7aa1df0f5ef0424a17c343da3dbaaed4f3c791f6e925b921f21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 11492 bytes
font_02_sfnt_off00014834.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14834 4324 bytes

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