Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec0a5dde88cfc93…

MALICIOUS

PDF

96.3 KB Created: 2021-03-08 03:31:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: cdbe50484482eb263350dbc8be3ee995 SHA-1: af7f4507ed802961716f0ca142037f842f6ee9f5 SHA-256: fec0a5dde88cfc93456b9b8ada56aca3d4f57117d29215493568c8ed5960e111
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it is part of a link farm, containing numerous external links, with one prominent URL being `https://resalured.ru/wix?keyword=delta+monitor+shower+handle+manual`. The document body, though heavily obfuscated, contains metadata suggesting it was generated by `wkhtmltopdf`, a tool often used to create SEO-optimized content or link farms that can lead to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=delta+monitor+shower+handle+manual PDF link annotation
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/4febe8db72e95.pdfIn PDF document text
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/42f46be9.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/rutunuzalufe.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/31982920511.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_256b4882a7524481861856a6501e480f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/rupinder_gandhi_2_movie_free_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/vevanapisasuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/39635203826.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_3845c0395f1d4138a1c7e8d2abe5027c.pdf?index=trueIn PDF document text
    • http://nanaxidimidi.atwebpages.com/movie_maker_editor_free_download.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/iatf_16949_auditor_guide.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_86208423928c4853bea24778554b53be.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_2a053d0a01ee4a1ebab7cdd5ff83476e.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_aede6ab155954cf5bc4621e50eb01fb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/reported_speech_imperative_sentences_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae340a4b-1319-40cf-9ed5-cd13a4688b33/the_new_strongs_expanded_exhaustive_concordance_of_the_bible_by_james_strong.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d38100-790e-4e80-9245-d441f31c8e12/zufejadet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D05 5036 bytes
SHA-256: 8cbd44f84ed1d2cfbf35fdf675022c2c5628c1668b9d08ec7413da06078c2b10
font_01_sfnt_off00013e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E04 11800 bytes
SHA-256: fa658c1831b787afbd4081d44b5d755025cb3d21b1911e674f10b63ee8e90824
font_02_sfnt_off0001662d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1662D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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