Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7828638f047b68…

MALICIOUS

PDF

83.1 KB Created: 2021-04-08 08:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a7a889602cf61ccf9037673f45e72d39 SHA-1: 796974c222982345ef0695234e67caec5f7baf6b SHA-256: ef7828638f047b682f4f3138adb8588097579de32c7c57fc962ac2f0a94ab870
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, appears to be a lure related to car maintenance, aligning with the malicious URL's query parameters.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+does+the+maintenance+required+light+mean+on+a+honda+accord In PDF document text
    • https://static.s123-cdn-static.com/uploads/4419452/normal_5fe292a8560a1.pdfIn PDF document text
    • https://cdn.sqhk.co/laxepinam/idCiiha/android_emulator_cleartext_http_traffic_not_permitted.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403683/normal_6001f689dfa29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5fff8191af143.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/Jtk3gd5/sears_craftsman_news.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/daduto.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/nwsibLm/pudatakeluwidafofifev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380230/normal_5fe4b6a387c02.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/fjjicji/58703811703.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/56102358087.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/T2wggoe/zuvup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494866/normal_5ffb3280c339b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_605f596dd7904.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kovezux/aiou_tutor_assignment_form.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/52241674900.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/pelicula_100_aos_de_soledad.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_852cfaf769b34c319c593eaad3d64ba8.pdf?index=trueIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_237187918ac3465e9bb4e443fe75109b.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 5492 bytes
SHA-256: f0987288b7e016f11ad9f84c17b2b0670a23ac6aa4931c8123102a28e9708f2c
font_01_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 11372 bytes
SHA-256: c250fbcf0ba432b120012cc7a1fb759fc4751b79761c9ffebe8146a84cb0e8e5

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