Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2fc90f8d8d17d9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 23:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3b74d2b58028448be3698f90fa913df SHA-1: 3ea4e3214fc6018789b2e24eec3db37aa8db1e0d SHA-256: 5f2fc90f8d8d17d9a124bd2f03fb68c7525317d5a99b2a94eeff3a73cb27b129
146 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous disposable domains and an IP address, likely for phishing or malware distribution. The presence of external URIs and a link farm heuristic strongly suggests an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=html+to+apk+online+converter PDF link annotation
    • http://mirsistem.com/depo/sayfaresim/file/64451869963.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/82384157386.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/75545799270.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109050119088179.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610b80068b---44061499433.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/zumutin.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/rulabutopevosozojalatog.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/xawupopisipanesubizow.pdfIn PDF document text
    • https://kildevangen.dk/files/zekem.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/bejumamamup.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/73448761639.pdfIn PDF document text
    • http://chromavials.com/d/files/luzorekaxa.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/4453016946.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/49033302406.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/pojutanob.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/polozudajedamezibog.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/vomukadefujewel.pdfIn PDF document text
    • http://a899.net/userfiles/file/suzuvaz.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613300e8e6b30---77662966204.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/famulez.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/39937518201.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/dizujixuvusisuribanojima.pdfPDF link annotation
    • http://icbiz.ru/userfiles/file/jidanixi.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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 10516 bytes
SHA-256: eab5a6ede6bad1a4572cfd18563909867621526c5f0c486e2ac07b5550ff7bd6
font_01_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 17700 bytes
SHA-256: 5e599a59ba74e16d5f810feb2a41c1ef35d468c1eca0dff5f5b167149fbbb373
font_02_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1