Malicious PDF — malware analysis report

Static analysis result for SHA-256 202220a138230394…

MALICIOUS

PDF

74.9 KB Created: 2021-03-12 09:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0140d4740fb2a1d0721406948597496e SHA-1: f70eea0b6659da23aafff1ab5bed1be128caaa4e SHA-256: 202220a1382303945b50edcbc7cc2e3f05bad1e5539b97c0e2e1999d9f750b62
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, suggesting it functions as a link farm or downloader, with one URL pointing to a disposable hosting service. The document body is heavily obfuscated, but the presence of external URIs and the overall structure strongly suggest a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://seumenha.ru/award?keyword=honeywell+thermostat+rth221b+manual+pdf PDF link annotation
    • http://raxejudesezix.scienceontheweb.net/telewo.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/the_quadratic_formula_worksheet_math_aids_answer_key.pdfIn PDF document text
    • http://kaboperesepasu.iblogger.org/english_grammar_rules_and_usage.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/42830597108.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/41075481683.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://subaxeliza.epizy.com/36243085588.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/julian_date_calendar_2020_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1ef3ef-5073-414f-9d5e-181ba06f6d9a/how_to_set_default_save_location_to_sd_card_in_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c786e0-fdcc-4c3c-a494-3c95095f9121/fidaxefux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e5ca8f-4740-47ba-bba6-50f5702f9f87/60123536026.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_864f7b3789724ee28d8511715d9ac5a6.pdf?index=trueIn PDF document text
    • http://limoxukuk.atwebpages.com/17778192657.pdfIn PDF document text
    • http://gatakokuto.rf.gd/75061166787.pdfIn PDF document text
    • http://puzekuzabi.epizy.com/is_sat_optional_for_class_of_2022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd84f27-20d8-4e43-a143-799a1aa34eef/multiplication_word_problems_grade_4_khan_academy.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/roland_spd-sx_special_edition_review.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_878b4b8d36804b3c821a101d141fcb58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/774564483.pdfIn PDF document text
    • https://6bda1257-ae7a-4fac-840f-d5dfc178f195.filesusr.com/ugd/f4de5e_cc1858789eaf4fd5959b7cc67e3bfa9f.pdf?index=trueIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_29881f0fda6441aab9683b3378ee9417.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_8afa10fa49d3405eb06c39bd60fb2e74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/prentice_hall_world_history_the_modern_era.pdfIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_fd27f55801cb4844910f7d63d7897702.pdf?index=trueIn 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_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 5760 bytes
SHA-256: b4b2bc87caeac3fea7f34ad1631c07b0d51b30a4919475cf8ec7e651ea897312
font_01_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 10204 bytes
SHA-256: 42dcd6124c0c07fab7f49978c73e1cd79ac253a6c1d62f65fd7b5edd97b4a053