Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef59dd30d9707bc…

MALICIOUS

PDF

88.1 KB Created: 2021-02-26 00:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d13cf592d7de08239f4587b8ca4862b1 SHA-1: 76788aab56b5a89ebeb41efca5f5ffcd97c60cec SHA-256: 5ef59dd30d9707bc3f2d2a1fe90a9685587c9518a454482585a9eeaa788c3457
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 pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://baarspo.ru/123?utm_term=halliday+resnick+principles+of+physics+pdf PDF link annotation
    • https://cdn.sqhk.co/vakanaju/D9eXhfC/mining_inc_game_advanced_manipulators.pdfIn PDF document text
    • http://supportcopyright.net/ssc_online_marksheet_gujaratooqwh.pdfIn PDF document text
    • http://purpless.vip/40201943962cvkj7.pdfIn PDF document text
    • http://whalesqpa.fun/korean_basic_grammar_rulesg8k3p.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/iijXjdt/temple_run_2_game_playing_online.pdfIn PDF document text
    • http://arenda-comp.space/how_to_charge_an_apple_mouse_2raby9.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/1BYihhh/strategy_and_tactics_ww2_walkthrough.pdfIn PDF document text
    • http://nikepexi.22web.org/lean_wit_me_piano_sheet_music.pdfIn PDF document text
    • https://paxuxitusokewu.weebly.com/uploads/1/3/1/3/131380341/levaxolakake-nasinominu.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/jiMibgg/celebrity_cruise_stockholm.pdfIn PDF document text
    • http://tk-time.site/partition_piano_truman_sleepso11na.pdfIn PDF document text
    • http://tegor.xyz/ryan_borucki_scouting_reportcjljd.pdfIn PDF document text
    • http://zanibajawin.iblogger.org/nfl_cheerleader_uniform_fails.pdfIn PDF document text
    • https://gilemana.weebly.com/uploads/1/3/5/3/135319463/6107335.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/xumakomowi/kibosu.pdfIn PDF document text
    • http://pejefovad.epizy.com/career_exploration_test.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/aecc_english_communication_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/90134463302.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 7032 bytes
SHA-256: 47d33987b0fcf3ad7a8c32467e898f5db270c2fa28692e332133c5527281ca60
font_01_sfnt_off00010c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6E 5080 bytes
SHA-256: 7d9fd3992ebedcfbfb600fc90196113f035bd094845ee2184d4aa870d2ee48e2
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 10868 bytes
SHA-256: be6e202d0b3a3f057d1b9fce5fbd6ac278b44c74b9f8515e91ba54c8f780ef56
font_03_sfnt_off00014253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14253 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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