Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9f3f26b1def101…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 15:03:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cec05a1e9a74cc5613708e50b9bbeffd SHA-1: e1da0f2ddf9f41f176c6e6f1b0a8c0c2380d7085 SHA-256: 4b9f3f26b1def101934dd100c28efa48dae262a753a325da3c239f827a614e39
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to 'https://jottigo.ru/aws?utm_term=sign+into+my+icloud', which is likely part of a credential harvesting scheme. The document body, though heavily obfuscated, contains text fragments suggesting a lure related to iCloud sign-in.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/aws?utm_term=sign+into+my+icloud PDF link annotation
    • http://polfact.site/104914694780lkcb.pdfIn PDF document text
    • http://bred-enligne.com/night_owl_960h_dvr_default_password438d9.pdfIn PDF document text
    • http://lovelid.xyz/reflexive_pronoun_worksheets_for_high_school32p01.pdfIn PDF document text
    • http://ctyr.ru/gibokerigelokeboxuj9qx4.pdfIn PDF document text
    • http://myimperfectmomlife.com/89528353040x3yrz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/what_is_spectrum_ref_code_s0600.pdfIn PDF document text
    • http://mutifitiwexo.epizy.com/calibration_of_thermometer_lab_report.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_381f6f49045c4b38969f61cf87bf61cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwosil/14174152063.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/71749611169.pdfIn PDF document text
    • http://xukobogovug.rf.gd/interview_questions_for_receptionist_with_answers.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_1307fcee3cd6457880e2ee454f959101.pdf?index=trueIn PDF document text
    • http://viwivebobip.epizy.com/sewotufuf.pdfIn PDF document text
    • http://gateguka.epizy.com/wagomidopapizawazofeti.pdfIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_176eb871f19f43b6b425c2274301f0a1.pdf?index=trueIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_13d9f58dddc846e2b710eecd989d7a11.pdf?index=trueIn PDF document text
    • http://girijasesevuso.epizy.com/59223634621.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_40626fc904b94a0e8fe35396cb9ab790.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_4b32e38ba06e4d73971f18e0aae8e55c.pdf?index=trueIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_cf194a82807e49e191e3d24030f7f7c2.pdf?index=trueIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_8e7e756266794636ae92cf74a7ac220e.pdf?index=trueIn PDF document text
    • http://rukukuwozar.epizy.com/85452825317.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_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 4980 bytes
SHA-256: 30d03e61e05676b60b42e1c797c06b81db70b5579cba65ae74aad4f7d8f6830d
font_01_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 10480 bytes
SHA-256: 03d883859726bc436443d4afe2911e2f3d322878bdc5afb1ef7f8784558d335e

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