Malicious PDF — malware analysis report

Static analysis result for SHA-256 7616ec135b1d99fa…

MALICIOUS

PDF

70.5 KB Created: 2021-04-06 09:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a92255485f21c126a15b1c448c1f1a68 SHA-1: 16a9ddee151117172f5c20eaa4f440a3673bbc3b SHA-256: 7616ec135b1d99fa0ee04a75aba64b7ddb234328103bfa6bd1e9e3e0723e5812
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting it is part of a link farm or phishing campaign. The ClamAV detection further supports its malicious classification as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=barium+hydroxide+msds+pdf
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/1466357.pdf
    • http://lufesemi.iblogger.org/77425991546.pdf
    • https://cdn-cms.f-static.net/uploads/4487005/normal_6027ef23d491a.pdf
    • http://betmoy56.com/kumon_h2_reading_answers7og83.pdf
    • https://cdn-cms.f-static.net/uploads/4366366/normal_6038191175f47.pdf
    • https://cdn-cms.f-static.net/uploads/4383805/normal_6064e61f521b6.pdf
    • https://cdn-cms.f-static.net/uploads/4407303/normal_601673099085b.pdf
    • http://dokakepitizix.medianewsonline.com/21877646395.pdf
    • https://cdn-cms.f-static.net/uploads/4470017/normal_603e958c27d2d.pdf
    • https://zunukewonodej.weebly.com/uploads/1/3/1/4/131453615/xagituted-pulubuzekag.pdf
    • http://fionainthefield.org/diy_google_cardboard_lensesp35rm.pdf
    • http://opensalon.xyz/what_is_a_2015_chevrolet_equinox_worthnkglg.pdf
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/zelesovosipuj.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/1241768.pdf
    • https://cdn-cms.f-static.net/uploads/4468838/normal_600e219a1d69b.pdf
    • https://cdn-cms.f-static.net/uploads/4385648/normal_601ce12bb4926.pdf
    • http://girepodemaz.getenjoyment.net/principles_of_agronomy_free_download.pdf
    • http://trujillostacoshop.com/95894148817cibfe.pdf
    • https://ganizosu.weebly.com/uploads/1/3/4/4/134434359/jadojakanutore-kebepefuwed-fetodij-ratudedigom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dipomik.epizy.com/doxumavafonabezafifidizak.pdf
    • http://mijalofatal.epizy.com/bikini_body_training_guide_two.pdf
    • http://tixofimisupabev.onlinewebshop.net/43436323397.pdf
    • http://zefirowiruluko.rf.gd/advanced_vocabulary_exercises_with_answers.pdf
    • http://dimazobuxijema.epizy.com/accounting_concepts_in_marathi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe7.bin
8d71e320ea7559f10556cf7f614cc9de2de324f1ff8ffa18f92547e0426aab99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 5164 bytes
font_01_sfnt_off0000dd7f.bin
0bb27be36dafa888980d686bea9afdf79a0064942b0bd636b40f1b215bfba498		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 9456 bytes
font_02_sfnt_off0000fdc6.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 4324 bytes

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