Malicious PDF — malware analysis report

Static analysis result for SHA-256 82691377ed731691…

MALICIOUS

PDF

73.5 KB Created: 2021-03-10 14:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f7baeba295f85f4f1cdbf783fb7d696 SHA-1: 2968617afb434fb3830eeb0fef24180b1a31cfd8 SHA-256: 82691377ed731691acb6858b2eb934653c78b9ce178ef4f3bdeaa56fba008b89
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to drive traffic to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/award?keyword=order+of+adjectives+exercises+intermediate+pdf
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/fubudaxaxukufo-tasalowukidaza-fuzagekamupas.pdf
    • https://futikuvevu.weebly.com/uploads/1/3/5/3/135349420/e42b1875505e9d.pdf
    • https://javekulu.weebly.com/uploads/1/3/1/8/131872149/110e498a298.pdf
    • https://sefovoridufu.weebly.com/uploads/1/3/1/4/131438839/medixoradago_siwupimarigumo_gatelezuzazufa.pdf
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/8e6625b7.pdf
    • http://fegikiji.iblogger.org/75896154712.pdf
    • https://zimosamizafokox.weebly.com/uploads/1/3/6/0/136091721/226111.pdf
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/5360377.pdf
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/8418141.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zaxawetawupo/brilliant_public_school_sitamarhi_worksheets_class_6.pdf
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_8f0c115fd0ea4ccbb6a9e7915996e271.pdf?index=true
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_125c3c72144840409a09354cf65d8caf.pdf?index=true
    • https://s3.amazonaws.com/gonima/update_anomalies_in_dbms.pdf
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_4964686c44e64163b03e23ffdc19d9a8.pdf?index=true
    • http://zebofazedixa.rf.gd/90432680004.pdf
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_b001b08fe56c405d86f1ff6b25bb85de.pdf?index=true
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_f9e4eb0750e942269c46e402baffc7f1.pdf?index=true
    • https://s3.amazonaws.com/kabisebax/70124704218.pdf
    • https://s3.amazonaws.com/zunaduxa/jifusokaxibom.pdf
    • https://s3.amazonaws.com/tesotiwapax/thunder_bay_catholic_school_board_volunteer_form.pdf
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_28e19ed8b67242eb9d2e4825d8b20138.pdf?index=true
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_ce77d499543842d4aaba857b1f7e7626.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_81f4e94823804c798020d2adfd66b6df.pdf?index=true
    • 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_off0000e267.bin
83d94771141c05aa78d6e3c8d715844810315a35a267ef0e93b25ab826eb0029		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 5500 bytes
font_01_sfnt_off0000f517.bin
5ef927305a9769dd26427a87f4f4d8cf9379b71655632c4e5f4a9dd788803421		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 10384 bytes

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