Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d79bfd9a5e4cd94…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 22:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e0ec633c3207680096b1a744fb41eadc SHA-1: fbb4c112501ad7cb4708abac5be1a2907b01e818 SHA-256: 1d79bfd9a5e4cd94f8e44f4777e1511d1d68f4f3bf398b9b3334a16dda172e74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=dragon+ball+super+broly+full+movie+2019+english PDF link annotation
    • http://almawred-sy.com/files/adminfiles/files/jatemavutuvesosumaxan.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/kabezav.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/nedew.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/58525826178.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/zomawapovo.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/rapum.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210910_532D9DEBFDCDD419.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210915194735.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/4c9479ee85efafd9cc9e9fce888d7a42/31141701251.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/5909848291.pdfIn PDF document text
    • http://aurora-c.jp/files/files/mizejopojipaderakasujewo.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/zibonot.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/dumogavokewinatodijinin.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/12100006191.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/54230455916.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/27301163407.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/tufomim.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/ropekabupipabuzodefizexe.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/wajojumil.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/99092616986.pdfIn PDF document text
    • http://emannsltd.com/userfiles/vabotatawokunufezusix.pdfIn PDF document text
    • https://forumsevens.com/images/file/73954685616.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_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 22400 bytes
SHA-256: 719083161757311b0ab72d4e81574bddd8fc7c4268bdd6c73fd16cc09eb9e630
font_01_sfnt_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 11592 bytes
SHA-256: 56445f95dc0fc2d25690e86b5eb82b28dc1e4a5a5ea827b1679d5b3dc199e82f
font_02_sfnt_off0001262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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