Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c9b2ef4081e95c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 00:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d0eaf9e5cc389efb5bb4f8f38040dbf SHA-1: e4b2a0e2274307339e587f5c10cdd2bd57c540ce SHA-256: 22c9b2ef4081e95c0763376472f19e25c02917c4733efd95f3539d85d80d9ce8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external URLs that host further PDF files, a common tactic in phishing campaigns to distribute malware or conduct credential harvesting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to this behavior.

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://queure.ru/uplcv?utm_term=head+soccer+android PDF link annotation
    • https://506hlapeta.com/files/file/21884807603.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/49076938488.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/lokaw.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/pevovezufememov.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/pamepapuzov.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/fezikimanos.pdfIn PDF document text
    • http://indexone.ru/upload/file/bufusutumidenoxafar.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656559081d---liwogumesijevujuwor.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/jefasisemitof.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/sawavowoxonokutepiraluwo.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/14063375643.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/simikudezolisitewun.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/7605854519.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/99639548861.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/24512769539.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021918_0518_265.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/ribipon.pdfIn PDF document text
    • http://profstil.az/userfiles/file/wirijerojona.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912004509196508.pdfIn PDF document text
    • https://webmenuplus.com/images/file/fowojiligikaxafebodoraviw.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/gejaz.pdfPDF link annotation
    • http://batterseataxi.com/survey/userfiles/files/tumurakadino.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144bf685b139---35378665701.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_off0000b84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84B 17272 bytes
SHA-256: e38cdfc6f33980be886722bb77bac6f8a1a05ebec528ed060a5cdd7c1eaa15a4
font_01_sfnt_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 10212 bytes
SHA-256: 39694448f3774155455bf79cbc4b0388c4a55bd343dfbd22dd0c22f6c45b63db
font_02_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1