Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34a72c619c35a18…

MALICIOUS

PDF

73.3 KB Created: 2020-11-13 06:35:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2203d09e3542cbaadaf135333be275ed SHA-1: b8d1b8daa05312a411eb131d0f2e0a126d64565c SHA-256: b34a72c619c35a18e0738ce23da10ad144df1050773eeaf4e27ac8492535cdac
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM'. One of these links, 'https://trafffi.ru/strik?utm_term=american+big+picture+a2+elementary+pdf', is flagged as unknown reputation. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to trick users into downloading further content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/strik?utm_term=american+big+picture+a2+elementary+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5f9fb915331ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_5f9f30a5e16a1.pdfIn PDF document text
    • https://palidabelegofa.weebly.com/uploads/1/3/4/3/134316445/1ef4c96cd8a2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/86554756397.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/65514007342.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/definition_of_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/zotiviranudidemu.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/99675264853.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/25247355954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a8b067-a682-4afb-bf08-4aeeb52aaedf/rapper_bone_crusher_net_worth_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b000ec19-2597-4005-ad48-0b273f6d7003/79582471613.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/74593816143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a6f8d7-0abe-45fe-839a-91f68de22f4d/maxiwezipagaj.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/jaretelugopomapiliburirip.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://scripts.sil.org/OFLIn 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_off0000c8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 5660 bytes
SHA-256: 55efac0636e26790d2106b98141fbd30136f67d4dccac9fc0e93f2e069c4facd
font_01_sfnt_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 11852 bytes
SHA-256: d06cad3d02d99c4acb1b98b74feb90332b34e039ea6d68fa63badd3ff4df657a
font_02_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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