Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b128a0f16e41205…

MALICIOUS

PDF

98.8 KB Created: 2021-03-16 00:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 73eaa683afec3fca57e8af46c5c7e8af SHA-1: 1b969c8b27eddcf8c0767d2ab6d9fdbc839c67c5 SHA-256: 4b128a0f16e41205d1db0d3047f64a5d2261b2c1900f5e7464a146be8f5662fc
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 0.9990

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://leonvi.ru/wix?keyword=expert+secrets+russell+brunson+espa%25C3%25B1ol+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493209/normal_6012f3a6901fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_603121fd001d2.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/ctyhihi/top_programming_languages_to_learn_in_2021.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/9666699.pdfIn PDF document text
    • https://movamapipimopi.weebly.com/uploads/1/3/5/3/135303402/daxolegaganinokobik.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/haThagc/fatifopoxazeguxe.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/eBZpB0N/old_video_games_ringtones.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500677/normal_5fec59a8040fd.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/ThfhjHK/63765094914.pdfIn PDF document text
    • https://tapotupuj.weebly.com/uploads/1/3/4/8/134866757/e77c264d557b27.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/9891685a-e877-47d0-b5be-fd55e07d8635/windows_7_screenshot_shortcut_mac_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/inov8_gaiter_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/57836707253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a1e16a-453f-4d92-b519-99749721928f/homelite_line_trimmer_hlt25cnb_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0b878d-11dd-4ad8-b75a-0d3b292fac5d/are_electric_toothbrushes_bad_for_your_teeth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd989048-0220-4efd-9ab2-9afd1dfdb826/sony_bdp-s1500_blu-ray_disc_player_review.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/20740971203.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/netawemavunurenozona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abd7495-e5e5-4295-b047-c7e53d60140b/how_long_to_fall_400_feet.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/expression_of_interest_to_tender_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd38cdf-5db4-496c-950d-5c4f89b43fa1/samsung_galaxy_s9_plus_case_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1d8f3c-1877-4609-9bc5-8683d03e21dc/wifijotuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945f2ea8-a77b-40c4-8014-23aaba3510d2/39354247597.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_off000130df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DF 5360 bytes
SHA-256: 88ad8613ead0d0fb178f45b36a4e99a336d9c0564481788bfca8e0a69541fa5b
font_01_sfnt_off000142db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DB 13052 bytes
SHA-256: f2f0ad274161355a697852f01bb5a3451bf5c3233637a987173ce1624b70a842
font_02_sfnt_off00016cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3