Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e534bd156137d7…

MALICIOUS

PDF

73.8 KB Created: 2020-12-22 03:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3ef90a4fbcbc1cec00ecb975ca4f004 SHA-1: 6d531e0e0272787aacc144317865bd20bb20acd0 SHA-256: c7e534bd156137d715f473069ad4bb303f714912af24a2cb9d30ba2431af968c
222 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'free download' and 'wkhtmltopdf', suggesting a lure to download potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/strik?utm_term=wooden+block+puzzle+free+download
    • https://cdn-cms.f-static.net/uploads/4481056/normal_5fd2758124d5b.pdf
    • https://gajorimimexawi.weebly.com/uploads/1/3/4/4/134458849/9918775.pdf
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f91614ed4ded.pdf
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/5d49d25.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fbd8d225-af13-4c4e-a078-228b63b6f5e0/semejeriduvimuvozome.pdf
    • https://static1.squarespace.com/static/5fc669b468612547ed83c202/t/5fcbfe8d6f0099009e4e3a0e/1607204493978/whatsapp_status_video_sad_song_female_version_download.pdf
    • https://uploads.strikinglycdn.com/files/80902c0e-d907-4914-9935-0dab238ffe8b/99717604359.pdf
    • https://uploads.strikinglycdn.com/files/05876208-4da4-476b-b606-87a42a06e725/wonder_full_book.pdf
    • https://static1.squarespace.com/static/5fc56c10405d5340f3480a85/t/5fca7889cef45959076ad19e/1607104653927/airbnb_near_me.pdf
    • https://uploads.strikinglycdn.com/files/770081fe-bdf2-4434-a458-f0f39e2bee27/gameboy_color_emulator_cheats.pdf
    • https://uploads.strikinglycdn.com/files/a0d43cc2-6dc0-4a08-857d-b94f7300fdea/stanley_yelnats_holes_character_description.pdf
    • https://static1.squarespace.com/static/5fc0873a11f6a4198483d0f6/t/5fc224b19b1ed03538248fa2/1606558897713/70372925640.pdf
    • https://uploads.strikinglycdn.com/files/170bf35b-4eed-437a-84c0-58fa95094033/10950911363.pdf
    • https://static1.squarespace.com/static/5fc5a4096b97992eb57be95c/t/5fc6685518e72e5fdbb38736/1606838357985/nujiwolozofosami.pdf
    • https://uploads.strikinglycdn.com/files/d84c32ab-5ce6-4b41-bc11-dd7597667e93/14744679823.pdf
    • https://s3.amazonaws.com/kikunojulejuj/django_form_charfield_unique.pdf
    • https://s3.amazonaws.com/datarofapakil/fotowenalen.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc3.bin
6f2ba3c2d30c5e8dc1cd6fc6008f84fa1c7d8048387a86485238da502146f002		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 5084 bytes
font_01_sfnt_off0000de2c.bin
1b46d5bc4fdbf0d6fe8c63cd43ee594182eadc69f4e4c2f28049411ad73c8202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 1792 bytes
font_02_sfnt_off0000e705.bin
641033910725d705e9dbe64fd3891a79b44e5580fb0eb5d0bdf6cdd0e55a2acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 10668 bytes
font_03_sfnt_off00010b7e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 4324 bytes

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