Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f587a2078b7c3b…

MALICIOUS

PDF

133.4 KB Created: 2021-04-02 16:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e382ec9ae25ccf9dbe50eb3d02c512b SHA-1: 2cd47c1b3c95bd7b39390190499b8cbe29426d40 SHA-256: 57f587a2078b7c3b7953b5a730d2a8f7df14181d1c5e5b1426512cdddd712da4
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF_URI heuristic points to a URL that could be used to download a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=lg+lte+settings+apk
    • http://jofifuneku.medianewsonline.com/10349547615.pdf
    • http://fasoxuxesatilu.sportsontheweb.net/hvac_meaning.pdf
    • http://katipef.medianewsonline.com/pathway_aterosklerosis.pdf
    • https://lodipopigib.weebly.com/uploads/1/3/1/8/131857338/94651.pdf
    • http://usejus.pro/can_a_woman_gain_muscle_after_40i8j1n.pdf
    • http://lupazul.mywebcommunity.org/gadove.pdf
    • http://legendnat.space/gonzalez_microwave_transistor_amplifierspknxo.pdf
    • https://mejulima.weebly.com/uploads/1/3/4/0/134040536/fukubazogi-gisopebepetive-zafapuvu.pdf
    • https://dojepojejexun.weebly.com/uploads/1/3/4/6/134668276/pexuvisez_pilal_vukuzerafure_deligularun.pdf
    • http://consumer-data-protection-bureau.com/75731943641w3hyg.pdf
    • http://nesarose.sportsontheweb.net/nosagodenelifarulaleleji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/busutafitufe/masterbuilt_electric_smoker_400_series.pdf
    • https://f19d2187-ce67-4d04-8798-eef694565169.filesusr.com/ugd/bd4746_1f55eeb90f1942debb28630d3eddc898.pdf?index=true
    • https://s3.amazonaws.com/jezobasit/what_are_3_destructive_or_negative_effects_of_volcanoes.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/kadepoxamuj.pdf
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_917f152b90dc4f05899cf59af4af3e99.pdf?index=true
    • https://s3.amazonaws.com/zarelusipofox/pregnancy_blood_test_results_template.pdf
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_e4890a183ed641388a4fbd40f687cdd7.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a9cd.bin
c2c791548f33c050e444894a99e30c3dcb73de2f4ede494b9161694b4a3aa29f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9CD 4572 bytes
font_01_sfnt_off0001b963.bin
0968bdfbad39aba47837726ae2b8a79bb9eac7db95c83aeeb7a0b277c7ee3574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B963 12140 bytes
font_02_sfnt_off0001e2f4.bin
b3d95354fc80a361dd48af21ae6ea2e9afed99d85c2a3657ec3a7d3405962d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2F4 16200 bytes
font_03_sfnt_off0001f844.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F844 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.