Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b214656de3f0e1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 20:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa7e7ad7bb436c27e5b3691193a9571f SHA-1: 9bfae3317e6880d844e8855c091115e0a12acdf2 SHA-256: 15b214656de3f0e1a59a47743bbde5dbad290bb77900fb42a0d9c881c7e47dc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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://smidgel.ru/uplcv?utm_term=download+helper+apk+latest+version PDF link annotation
    • http://hajnysport.cz/FCK_userfiles/file/wiwulekozofavamiv.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/majadel.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/35670595217.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/67609986311.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/guzikagizukapazo.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/vubitami.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/37855486903.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/bekelamesev.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/36274069540.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/45075156006.pdfIn PDF document text
    • https://digicpictures.com/downloads/95931300281.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/pekimobuk.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/kedizimonosizab.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/34844067838.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/tixavidotuko.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/wujoxifuzovupedibuj.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/nowapisakavin.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/zamef.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/40588838669.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210908055258.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/37168794353.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/dokusow.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/57044303789.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 19256 bytes
SHA-256: 74d8dc9bd01604b987827887855b5f838de9cae140e011a9d4f536e8446915fd
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 10736 bytes
SHA-256: 43f03b17e02fe8e6ed0ee45609949d0a850dc4b4c17df1a1e34e220105c43d5a

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