Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2ae3776cfb7683…

MALICIOUS

PDF

82.3 KB Created: 2021-10-13 12:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 72f997ca0da393f1f667962797df0b91 SHA-1: e95b68dfd0be507921a6c212bad7be0983944ae8 SHA-256: be2ae3776cfb768360e2b06a887f6adeb68397218ee404b1ab7cb650fafead2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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 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.
  • 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://infrive.ru/uplcv?utm_term=how+to+find+molecular+formula+from+empirical+formula+without+molar+mass PDF link annotation
    • http://www.tomasjelinek.com/img/pub/file/15129029493.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/5138824912.pdfIn PDF document text
    • https://wittnebel.dk/file/xevomaxonikabotoxofelod.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/74828304681.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/guxuwozetujasinezibi.pdfIn PDF document text
    • http://grimastone.ru/files/57492153567.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/xajatuloxegonutudorako.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/37810005138.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/bedorobewasugepa.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/95325787142.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/magusavivorirepas.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/20061813170.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/rotapunepopisepupuf.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/siwana.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210925090818.pdfIn PDF document text
    • http://apothepharma.com/upload/files/50893685115.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/zofij.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/viponalomopava.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/zisaxiwamup.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/78595729855.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/revaruke.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/viwazajovogate.pdfIn PDF document text
    • http://tencanpowder.com/d/files/55593598075.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/99095494078.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/28859252188.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/19239366848.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/sugunilovometewatubotaze.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_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 11064 bytes
SHA-256: 3ac459067d0647a169a7d046d5aae848373e509c4c3441958cd355c110327d26
font_02_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 19752 bytes
SHA-256: 0638fe5a70c2e270711011175723845076848bd704f8c9ebc7c5a87d07db79f3