Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78dfabb6db8a1d3…

MALICIOUS

PDF

73.8 KB Created: 2021-03-12 01:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 17c7e5c5a99b4eed026a4984da6100b2 SHA-1: 20f89639925924de21f58d86c65edc3a28f46433 SHA-256: f78dfabb6db8a1d3a3aa5e575841d1beaa11d858e0cad39e34aa151b4fbd600f
186 Risk Score

Malware Insights

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

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 0.9993

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
  • 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://leonvi.ru/wix?keyword=geometry+proving+lines+parallel+worksheet+answers PDF link annotation
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/b3b92bd8989a.pdfIn PDF document text
    • https://diruwogedow.weebly.com/uploads/1/3/1/3/131382439/tubijaxapadawu.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/best_total_body_stretching_exercises.pdfIn PDF document text
    • http://zokazurimila.mygamesonline.org/new_trends_in_computer_technology.pdfIn PDF document text
    • https://rejafolurolege.weebly.com/uploads/1/3/0/7/130740622/3767485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_600d082fa4319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484632/normal_5fdc97fa255cd.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/how_much_does_a_250cc_dirt_bike_cost.pdfIn PDF document text
    • https://bisulejejokix.weebly.com/uploads/1/3/4/0/134042342/133101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_60358b51d9ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_602b0d1383944.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415745/normal_6007059bb3712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470408/normal_600fc7e16aed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_601be59e5596c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388841/normal_6005b171797dc.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/130d08b1-1174-45df-a028-6b38d21d6502/how_to_calculate_number_of_atoms_from_moles_of_a_compound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd12ae65-3263-4e2c-9de0-11f9377519d8/buwipabiweto.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/vupolezuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a550dd4f-e515-498e-9c94-018762d03c5a/autodesk_3ds_max_2011_free_download_full_version_with_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3de152f-33f5-4abe-9874-de5e5dbae9be/18566279516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2996ecf4-5fd7-43e8-9d17-833f3b52dccd/88783669505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5170119d-4084-456a-a988-6076bbc4c902/how_much_does_laundry_service_cost_in_nyc.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/91504740651.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_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 5584 bytes
SHA-256: e08182a76c4a2a067a2021c5ed9b704582231a202c630dc629c770a7a59d4594
font_01_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 9868 bytes
SHA-256: 042c6f1d256382d8d9f2473eefef8f53acd83986aa2f7e7dffdbab4faeadabfc