Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eafca92b8d507f…

MALICIOUS

PDF

87.8 KB Created: 2021-03-29 23:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5bb0b52144bb1089b05e54d85a6c4c32 SHA-1: 99e02da36e8148bfd43f8adc782d470d1a6f703b SHA-256: f1eafca92b8d507f2dfbf7ad9b50ca96a4343dec15c25c11af351a1259eea805
146 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. It uses a QR-code lure. 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 0.9991

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://baarspo.ru/123?utm_term=chapter+3+vocabulary+practice+economics+crossword+answers PDF link annotation
    • https://cdn.sqhk.co/zoxowowi/dmKHXKk/86680838862.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/gghhgfF/pldt_pay_express_online_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/Uhhk6jb/business_manager_duties_in_student_council.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/lavuwilututan.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/jgf4hfq/45466517873.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/surah_mulk_sheikh_mishary_mp3_download.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/gavesonezawivivide.pdfIn PDF document text
    • https://cdn.sqhk.co/ginijetemepa/jbjiigi/33727160194.pdfIn PDF document text
    • http://sakepugikunon.mypressonline.com/77123790842.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/811d4db3-0010-4621-bea7-d11dea0bfe0f/assassins_creed_unity_the_book_thief_lantern.pdfIn PDF document text
    • http://nufejubonuviwo.epizy.com/ashampoo_music_studio_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f89cd9-e02f-4515-b06d-08bf8a7ef8f6/lofugizanixokalabuj.pdfIn PDF document text
    • http://boxijekew.atwebpages.com/barium_meal_procedure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6cfa07-4548-41f6-a73b-36e935a97257/can_you_lock_hidden_photos_on_iphone_8.pdfIn PDF document text
    • http://dudasuz.epizy.com/kolar_weather_report_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8047d96d-278b-47bd-b0a0-e665114a8d42/wipizupudako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3bb8e9c-5797-4d1d-a383-a8a1713c9789/is_evening_primrose_oil_good_for_acne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64d4909-d978-42a9-8b2e-0969b67000a3/what_size_is_30_x_60_cm.pdfIn PDF document text
    • http://witesibezixu.epizy.com/temomigirogajepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e890ee88-783d-40be-aeb3-154a58e1c688/halfling_names_funny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f94bf13-4cc7-4a0e-b35b-1d43df05bfb2/farmall_h_12_volt_starter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/385d23fd-2a78-4441-8a27-0a2ecb5edbb3/44682805128.pdfIn PDF document text
    • http://wufikemofumop.atwebpages.com/60700351394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092c726b-e453-49d5-ac7b-3a5bde63bf9a/newoferadiriselepugadeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9c7ef1-fc56-4707-b8f7-6b6177eb20b0/93269506766.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_off000116c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 5776 bytes
SHA-256: a59f15e3cc45095d4eca37f1ebe01587462f3ce7275391b334fecb07ad1e231c
font_01_sfnt_off00012a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A53 11400 bytes
SHA-256: d8c9e53835e5b7dad01f420d6bf50d5d339ea485c6b6955cf73de101a75d03d3