Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de498675e1471a7…

MALICIOUS

PDF

74.8 KB Created: 2021-06-06 20:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b2f5d305b907ea89bd10d09642e95276 SHA-1: 87e1d2d16badabaf93ee10a059d1d0d0bd056c00 SHA-256: 8de498675e1471a7dbf672c2bc787fba0aaab48512591109bd542a9bc47052b9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/pbw?utm_term=how+often+do+i+need+to+have+my+septic+tank+cleaned PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377925/normal_60330ea08a037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_60b9a1ad719c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_60379b82d7b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_605b37c50a5ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485689/normal_5fde8f7cc48c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_60186c64d8517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_5fe882d7ee191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450347/normal_603c67d7e703a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376601/normal_6001b01d15f10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2d945b-74ae-4fec-8f7f-9d708c633e32/mothers_day_inspirational_quotes_to_a_friend.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8673c97c-81fa-43e8-8d18-d61f6422c7a5/how_to_flash_firmware_of_tx6_android_box.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/nipiwufibokowoweten.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/what_do_henna_tattoos_symbolize.pdfIn PDF document text
    • http://figuduvimeti.pbworks.com/f/4279333296.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144467100/33074852405.pdfIn PDF document text
    • http://dejimebez.pbworks.com/f/repapuvobigajifatexulot.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/w/file/fetch/144448224/vixafebavoxagaz.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144474621/ahk_bhop_script_cs_go_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2f0c3c-6265-45e1-bc83-22314b2b446b/tozut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/226e48dd-40f6-4eb5-b93a-ea096b07c250/57495531384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56a3550-8813-41ba-b51d-2af867a08807/python_tutorial_online_class.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 5576 bytes
SHA-256: eb4136b91ff4effc8b6be04d8893d5f9aea5aec5fd76824268fe6a76fe45ad6b
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 10788 bytes
SHA-256: 247ef69aded1190c8dd3177edbae0782e1e7ffe0f6c0be3c49b4c5b007b45432

Open this report in the interactive analyzer, or submit your own file for analysis.