Malicious PDF — malware analysis report

Static analysis result for SHA-256 851efe15bc5983ff…

MALICIOUS

PDF

81.8 KB Created: 2021-03-17 22:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6a200da55655b6b57f08346c7679e6d6 SHA-1: 1a2c7476edef6f8205e9a27deb43073bee589e71 SHA-256: 851efe15bc5983ff626f6e33b271f3669b35816a7de94a78ecedeede008c23f1
186 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains. The document body, though heavily obfuscated, contains text related to connecting Google Forms to spreadsheets, suggesting a potential lure for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/123?utm_term=connect+google+form+to+spreadsheet PDF link annotation
    • http://regvoolkim.website/p1lan.pdfIn PDF document text
    • http://mekozeka.66ghz.com/large_numbers_worksheet_grade_4.pdfIn PDF document text
    • http://armlur.space/xusewsrai7.pdfIn PDF document text
    • https://lozofatogil.weebly.com/uploads/1/3/0/7/130739213/6e29fd41b4.pdfIn PDF document text
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/5686988.pdfIn PDF document text
    • https://kapilike.weebly.com/uploads/1/3/4/6/134686456/kutuzokopufipo-bufezarodurube-sudatug-jibebogajal.pdfIn PDF document text
    • http://grusha.space/lebixememekumu8h7m.pdfIn PDF document text
    • http://misstourist.info/kujixoxudubejujerud0x45x.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://uploads.strikinglycdn.com/files/af663934-8a16-40ea-a8d9-b240d70d9086/gitiwugavabuwaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e54ab95-138b-4b72-a577-648b7929d19a/the_last_song_full_movie_in_hindi_dubbed_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5309b7b-7070-41d5-a823-3a7057128a98/how_do_i_connect_my_canon_pixma_printer_to_wifi.pdfIn PDF document text
    • http://zaxowudupa.rf.gd/84310945307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41fdcb7c-04c8-4653-b781-5fb3e692ef8b/hp_color_laserjet_cp2025_fuser_maintenance_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2cf703-859b-481b-b1e1-02f3f8055771/what_does_the_boy_scout_oath_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14932b94-ceb8-41e1-a648-99eb8dd0c550/19107619522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d54fe4-f228-46fe-815d-c77fb01d8170/71551867774.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/visual_studio_2019_shortcuts_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/lipevawiguv.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/gynaecological_ultrasound_report.pdfIn PDF document text
    • http://xonefepuvimami.epizy.com/gagalebikekelokobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb171469-753c-4fa0-a800-f89fec5cbd3d/braun_coffee_maker_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42e97f8-b131-4851-a06c-df5f5d2efb8a/pawunobalaxiwenisemajo.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/lewumuxowurudeda.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_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 5332 bytes
SHA-256: e0941f1ea70f9cbf1e59f5b4e22afa02226afb848a81159add96d2e550292def
font_01_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 13272 bytes
SHA-256: ce5ab020b7980749bab69e93d6f486f2c9e1ae2a29eb53c84923a6f1d11a9129
font_02_sfnt_off00012b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B90 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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