Malicious PDF — malware analysis report

Static analysis result for SHA-256 33732f2067ff8f8c…

MALICIOUS

PDF

70.1 KB Created: 2021-03-17 11:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bfcb930893ab85d620188eccd403a5b0 SHA-1: dff6da2ff24cc9d0ceeca80c4565397cecb3df1a SHA-256: 33732f2067ff8f8c403fe8165fc583a0b1efa8fc937e4ee6023b05aa50048f12
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=gcuf+date+sheet+2019+bsc PDF link annotation
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/0f51d4f41ef33.pdfIn PDF document text
    • https://vubopedu.weebly.com/uploads/1/3/6/0/136083963/jekagemirekuk_duvob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_60176e5ec960a.pdfIn PDF document text
    • https://xaleratugigajij.weebly.com/uploads/1/3/4/6/134631249/09d670.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369772/normal_5fe2ac02b548d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5ff7d780e980b.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/plant_physiological_ecology.pdfIn PDF document text
    • https://popewike.weebly.com/uploads/1/3/1/4/131407195/seviberu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471256/normal_60421d1369440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_14d5accddb8f4d0cbfff44eaadb7c7d6.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_0054dc2e2c7045e6a8447646a43168a1.pdf?index=trueIn PDF document text
    • http://tavamikilav.myartsonline.com/sony_rx10_iv_manual_focus.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_8e622128645d48cc9c0ccfcc33ad96aa.pdf?index=trueIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_167151933f4349659d582a7c3ba9539f.pdf?index=trueIn PDF document text
    • http://sazororazinub.epizy.com/kaxogunuwurox.pdfIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_57ae168ce63c49c7ad451fc7f3a85266.pdf?index=trueIn PDF document text
    • http://xarugipofe.epizy.com/lefame.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_20098ed80a9142f1a1d8b9186240a372.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_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 5632 bytes
SHA-256: a23ebbdc62d6988ff7d8a2e49725784bdaa5734e97e7c783c47dc6c709bdb2b0
font_01_sfnt_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 10388 bytes
SHA-256: 087eccbc12ae8adafcc3d96dc525eb20866cfda64dcf8228d64a78623058febf

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