Malicious PDF — malware analysis report

Static analysis result for SHA-256 540883667e9d5ff3…

MALICIOUS

PDF

75.3 KB Created: 2021-01-24 11:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9042da1b924ad6f033fbb77fee28541b SHA-1: 14faa0b989730db41e673f0521da95ec4fc62845 SHA-256: 540883667e9d5ff3dffbec65ee1a0325153b4c19a84055e96eb485dd4f768e3e
234 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors or link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this. The 'SE_CALLBACK_LURE' heuristic also indicates a potential phishing pretext. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/123?utm_term=murrells+inlet+pier+fishing+report In PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/jid4gcc/marshalls_home_goods_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/remudejifi/jayjbhc/kadimetunijatotumepafoti.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/uqwjiCX/canon_camera_connect_mac_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/c7iiOkp/national_park_jigsaw_puzzle_100th_anniversary.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/5hjlheB/fibibevov.pdfIn PDF document text
    • https://cdn.sqhk.co/tubawonidas/iijbFjc/avengers_game_demo_release_date_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/j19jUjh/takeout_restaurants_closest_to_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462096/normal_5ff771e47a71f.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/8jfm2Tw/world_war_iii_1982_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/hIjgUX6/35475619755.pdfIn PDF document text
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/fikib.pdfIn PDF document text
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/bubebajinurizemi.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/jiqhdgh/crazy_bird_tap_tap_dash_online.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
    • http://sesukunijekoti.epizy.com/bixodatanuxu.pdfIn PDF document text
    • http://xulodolab.epizy.com/24746733821.pdfIn PDF document text
    • http://molulig.epizy.com/carpigiani_van_1_machine_manual.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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 4840 bytes
SHA-256: da5bdae38534781facb1b34a0e327e6d7d735702aed5a827bd5a4b2bd1aef936
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10452 bytes
SHA-256: d8ba5e1d02ef5987d89d7f982b4fc7112facad5b5db82c00424877969c6cd25e
font_02_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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