Malicious PDF — malware analysis report

Static analysis result for SHA-256 178b4bb46bf9c802…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 15:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9c8e0e96d2d759e3242e7efbaa2b015 SHA-1: f13a30b4ef27cc5d3126925b5300ed19b9971169 SHA-256: 178b4bb46bf9c802e9d80ac327fc4d794bc52ac62157692fed3ad95272f666b6
134 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. The presence of numerous embedded URLs and a heuristic indicating a link farm on disposable hosting suggests a phishing or malware distribution campaign. Although no scripts were extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=zombie+roadkill+3d+hack+version PDF link annotation
    • https://www.natursany.com/ckfinder/userfiles/files/4560371920.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/927961066.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/kawolulu.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/32047112824.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/53343785894.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210918174913.pdfIn PDF document text
    • https://ratoempat.com/contents/files/73589425387.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210904190626.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/kuterovodisemure.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/lukegidoviguged.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/33124230210.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/50020720141.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/bijabuveborarobokeviga.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/27809676751.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/mazeveronepuraduwawikuf.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/gifuzuz.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/88001677727.pdfIn PDF document text
    • https://ms01bet.net/contents/files/jopefawabopuli.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/sodirodesegivimu.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/83347612224.pdfIn PDF document text
    • http://bndweb.nl/upload/files/dekakevegirubidoximevalov.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/fiwomufajarudoza.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/zuliwowatinudaz.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/moxolonutesot.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a84c29f7e---56519039867.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_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 10968 bytes
SHA-256: 6a88ee5d630d89664574294489d1b2178ec82c4f9d67039ffa2783ad66ce3973
font_01_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 17396 bytes
SHA-256: 948e3ad38784da1a79b4b9c86001b142bb04184dba55e760f77e66f043a81a5a
font_02_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1