Malicious PDF — malware analysis report

Static analysis result for SHA-256 da92ecd830767708…

MALICIOUS

PDF

81.6 KB Created: 2021-03-08 02:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f39defdf296d0c9e688dd36eea7214b8 SHA-1: 527f2e5ee96c053592e57f6f592596bb4f7ded61 SHA-256: da92ecd83076770806a81123d5ac857958b97458a8106e9a3b6fb4f230d075f8
164 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a large number of external links, many of which are to benign-looking PDFs. However, one critical heuristic flagged it as a potential phishing or trojan delivery mechanism, and ClamAV also detected it as malicious. The primary malicious URL identified is 'https://leonvi.ru/wix?keyword=section+9.3+theory+of+plate+tectonics+worksheet+answer+key', which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=section+9.3+theory+of+plate+tectonics+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500447/normal_600a57418b5fa.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/9699201888.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/shatter_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_5fe7909f4f8d0.pdfIn PDF document text
    • http://wamepiguvoj.iblogger.org/aprilaire_500_owners_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5ff95fd9d24f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501962/normal_604564561d34a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butorinowu.myartsonline.com/neil_anderson_steps_to_freedom_in_christ.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/cursive_practice_worksheets_for_2nd_grade.pdfIn PDF document text
    • http://bumosutu.rf.gd/eight_domains_listed_in_the_isc2_cissp_common_body_of_knowledge_cbk.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/fugowixugarolavisote.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/85651530094.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_830a3dfaffe0457c8a1b9ec5a0ed4bcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazivemon/zemofu.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_a1317d297e8a42a392136a59291341ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/72704789278.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/fisiopatologia_placa_de_ateroma.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_77237b2dc5a1494984ff5fa47bd51607.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voropa/percy_jackson_lightning_thief_graphic_novel_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 5816 bytes
SHA-256: 85566f060888ef5ace0cad921d953026c1be459ecbd01bca13a571a9c682648c
font_01_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 10212 bytes
SHA-256: b69260d49eb9df628f1abea2e9a15f41d4fcd3270d38680e123b5d7d6959029b
font_02_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 16084 bytes
SHA-256: 2e6e85b7b3773207d50f59764995227ee5d260f7bc80f59437f9981b9325e8b6

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