Malicious PDF — malware analysis report

Static analysis result for SHA-256 f144a26ecc3deed0…

MALICIOUS

PDF

87.4 KB Created: 2021-03-11 03:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bc5f172f3757e7253590c270a100cff3 SHA-1: 5a330836653da852737f71694f2eef92bfa2cc30 SHA-256: f144a26ecc3deed04ee705349a2ac6e30dce5f4dc85bee924a2b1370be0bab4f
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 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 0.9996

Heuristics 5

  • 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://midufefew.ru/award?keyword=ccc+malayalam+pdf PDF link annotation
    • http://korogesubelokut.mypressonline.com/best_free_app_to_learn_chinese_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393359/normal_5fec267d407d9.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/28681653986.pdfIn PDF document text
    • https://kukaweferoba.weebly.com/uploads/1/3/4/7/134754127/6729567.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/aQPL0gj/nuwaruvitalujemevika.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/fuxiduwomepe.pdfIn PDF document text
    • https://cdn.sqhk.co/kixeworu/dz3ijhi/kiwimedipokepasalobobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482849/normal_60009c7972af0.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/75036571056.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/dA1I9Jm/95627473705.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/b3vjjie/dagebaziz.pdfIn PDF document text
    • http://masanakepatarar.iblogger.org/sex_and_the_city_seasons_how_many.pdfIn PDF document text
    • http://nosaxumuv.iblogger.org/esmo_guidelines_hodgkin_lymphoma.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/ijdjd16/gaganuzaluxeg.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/papivukadipivixurogapin.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/4bc13e7c-d646-4204-9aa5-1ce88941848a/how_would_you_define_a_religion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81561414-1e10-4b36-be3b-427bf1091c05/is_arbys_fish_sandwich_still_available.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/what_does_a_manometer_measure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5d0a92-941d-469e-aa7c-4de3365a29e5/julius_caesar_act_3_scene_1_modern_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c19c1a-f69f-4d65-8ce4-c9176d348d7d/p90x3_classic_schedule_printable.pdfIn PDF document text
    • http://zixupav.rf.gd/abstract_algebra_theory_and_applications.pdfIn PDF document text
    • http://taxifegizuni.epizy.com/private_trust_deed_format_in_gujarati.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_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 5032 bytes
SHA-256: da5073deccdd9a8788f8fb466bac656f5a96ddc7d5f63b6c7aeab59b24ccdfb4
font_01_sfnt_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 10208 bytes
SHA-256: 01806822706bc32d09f998d7d7824b42bb2da41add333aae301c78d19cc44937

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