Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1866b0e2380567…

MALICIOUS

PDF

76.3 KB Created: 2020-12-31 12:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cb116d4e32291a76fea671bfe6bee119 SHA-1: e3717e349e8ae3024d16fc5eabb22c8beb808901 SHA-256: 1b1866b0e23805675688d79ff7227aeab3afcd54c25edb89a36e5f6f7bfedd45
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://trafficel.ru/strik?utm_term=hot+wheels+unlimited+apk', appears to be a lure for game-related content, likely to drive traffic or distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://trafficel.ru/strik?utm_term=hot+wheels+unlimited+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5fe8775de06fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_5fe61fb7d8852.pdfIn PDF document text
    • https://wapavamo.weebly.com/uploads/1/3/1/6/131637186/5927839.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/FjhDogg/5710058669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_5fd3413450d00.pdfIn PDF document text
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/84dbc865.pdfIn PDF document text
    • https://tozusasulinun.weebly.com/uploads/1/3/4/8/134872335/7507659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5f8b386b5737f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5fcb2a897c3ef.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/zifozujiwi/govenutulegewasegeseleg.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/xegurajidudujusarunaraz.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/petemevavis.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/daluziwukuladulale.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/guperex.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/electric_circuits_grade_11_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/ghersi_il_cemento_armato.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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 2856 bytes
SHA-256: ede077bcf9d936b2deabd1ca36e5cf164b77d75f1467ec74ab7a8d43bb048d6a
font_01_sfnt_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 5220 bytes
SHA-256: f864e2f50b2f549a4984f00c64d1ffe6380aae2c70d7eac9887708b2c51c8261
font_02_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 15708 bytes
SHA-256: 2bb55dcb2df4a6e18956ac3d070c458c7ee4099c4b5fd453f0a8ccce36056779

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