Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff00e7a3598a24bc…

MALICIOUS

PDF

76.6 KB Created: 2021-01-28 01:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0575125605ad12178c7d85b8a86942a5 SHA-1: e3aebe79b58ecd28f71ad9bc8566dd19270cb5a5 SHA-256: ff00e7a3598a24bcaeb612c6f2b827d53207b5535faedb638c25bd2da92e4fd1
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to redirector infrastructure or are part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers'. The presence of numerous external links, including one to known malicious redirector infrastructure, indicates an attempt to drive traffic to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://yafferge.ru/123?utm_term=30-60-90+triangles+worksheet+answers+a%25237-6 In PDF document text
    • http://medyahanem.com/crafty_crab_menu_jacksonville_floow2w.pdfIn PDF document text
    • https://cdn.sqhk.co/tadeketoxab/W4Qgg6M/trap_dungeon_2_water_level.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/jgOhihj/86640410692.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/645a9b8760e.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/hcrhhir/towebewejabubeduwesuv.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/hgJRsBn/tower_conquest_hack_game.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/okqhgjj/99681013302.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/4221220.pdfIn PDF document text
    • http://adminhalil.com/98357791456o8zdj.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/0VW9iyW/zufepa.pdfIn PDF document text
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/jevusolumakosixu.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/etidgcZ/download_drag_battle_mod_apk_obb.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://s3.amazonaws.com/jalasilunaz/electrical_safety_audit_report_india.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/98272891200.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/shake_your_body_english_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/report_on_inter_school_debate_competition.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 5444 bytes
SHA-256: c36b7ef1f2de8dd8094ac613a5a90ab0f72e89e64adf5f2b81b9181ff0d7293d
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 11428 bytes
SHA-256: 7418cc9964d06b372fd803e61b988b5afabe55e1cd0c18c4a32f6adcb671688d
font_02_sfnt_off00011787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11787 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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