Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee591c9a22139a83…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 22:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df255689360fc6d4de763ec688aa77a6 SHA-1: 790940aa6f7f4610cf397725fef9f8f1f27c7c3f SHA-256: ee591c9a22139a83c8bfbcf183d7fe8a6175f54ca0f3ce8acb0a04470b7d51b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=the+secret+of+eternal+youth+pdf PDF link annotation
    • http://mnogonomerov.ru/uploads/file/4887040582.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/86681269353.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/25688901758.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/lutemamidoke.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/13442904956.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/53658140229.pdfIn PDF document text
    • http://tano-cable.com/d/files/26910224260.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109102104196664.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/kazukebawe.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/vonezawumimegev.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/40205077306.pdfIn PDF document text
    • https://redac.ch/upload/39046809153.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109070756013434.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/40439901037.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wifevalepikodatiriponif.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/60154743531.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/83488361304.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/22373387289.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/88292962212.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/wedagokezamerawim.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109030508542433.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/56702609600.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/xudum.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/bepekubumela.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_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 10804 bytes
SHA-256: 5a1064d4c7891781f76f5f92ea320f22cf096ce254dcbfcee7843bedc35fcbca
font_02_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 18104 bytes
SHA-256: 78ace8ecd40c45ff91082db3a2c14f30bf87912c0782257322aef763e8a2353a

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