Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0a2c1c351976c0…

MALICIOUS

PDF

68.8 KB Created: 2021-05-25 03:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e89ea7893eee9ba26d8212f81c1df40 SHA-1: 245fd33d0a0f189462a4e088e351588a27b1e90c SHA-256: 1a0a2c1c351976c071d82d31b93f1e8e05dbd1619f326ff4b5c1b037f36f9dfc
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct the user to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=surface+pro+4+price+in+bd
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/21cbb8.pdf
    • https://cdn-cms.f-static.net/uploads/4452374/normal_600e228d71514.pdf
    • https://buruwezixefekiw.weebly.com/uploads/1/3/0/7/130738548/miniroxageg.pdf
    • https://cdn-cms.f-static.net/uploads/4490950/normal_604db14b84837.pdf
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/xogupap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/584b2dc7-195c-4445-bd8f-5473926c9b4d/how_to_connect_bluetooth_to_pioneer_avh-200ex.pdf
    • https://s3.amazonaws.com/rujabepifar/41977666708.pdf
    • https://uploads.strikinglycdn.com/files/bb1ffe86-cde9-46de-89d2-6f322f440347/the_crucible_act_2_study_questions_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/094e7dda-c924-4c75-ad7d-144387bf591d/what_is_the_best_balisong_knife.pdf
    • https://uploads.strikinglycdn.com/files/b271160e-3330-4100-bb43-be87f1f21a81/74642266038.pdf
    • https://uploads.strikinglycdn.com/files/8991a386-c6e1-4207-bc49-69f3d79b47c8/how_to_write_a_script_tv_show.pdf
    • https://uploads.strikinglycdn.com/files/de38b740-ebe3-48b7-a65c-f42b79d7b3a7/la_educacion_media_superior_en_mexico.pdf
    • https://uploads.strikinglycdn.com/files/88e5ec54-3bfc-43a0-b56c-a7fcf8dd3e45/52040234079.pdf
    • https://uploads.strikinglycdn.com/files/23ecee27-04df-4407-b28d-9b10712ffeb1/naming_mixed_ionic_and_covalent_compounds_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/ff9287d8-9c72-45a0-8f79-3b4fbdfe66e2/58754311307.pdf
    • https://s3.amazonaws.com/latufenaw/mazezodopaveku.pdf
    • https://s3.amazonaws.com/lazesej/90479061410.pdf
    • https://uploads.strikinglycdn.com/files/2def7d12-26cb-4185-9c06-5e01e36caf51/maytag_dishwasher_quiet_series_300_filter.pdf
    • https://s3.amazonaws.com/libeganot/noratujagopuzikis.pdf
    • https://uploads.strikinglycdn.com/files/cf0b3a36-e305-4e7e-90b4-012f6484b39a/tulelas.pdf
    • https://uploads.strikinglycdn.com/files/7b92bae0-2969-44ce-b8a0-d92c725827c5/43649053984.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce26.bin
830cf9c19bdf7be3585ea38eca142ca89988dc5281c5735bf046f7f09553ed61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE26 5272 bytes
font_01_sfnt_off0000e01b.bin
13f66d83c914d296849b975a1be3cf961dc939f55302c7037975da9920747e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 10712 bytes

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