Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cb2f12272559b5…

MALICIOUS

PDF

80.8 KB Created: 2021-01-11 22:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 835980931c314adee5a8cd6a1cb0e7a7 SHA-1: d8563320b2c8350ccc9d805d59fef45d18d419d2 SHA-256: 53cb2f12272559b561c7201767278d9a640cb22bd72bd5202aaf523cf5199fe0
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector. The primary URL, 'https://ggtraff.ru/aws?utm_term=best+alarm+clock+android+2018', is flagged as malicious. Another heuristic indicates a PDF link farm, with 'https://s3.amazonaws.com/widofafane/43985352297.pdf' being a prominent example. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or redirecting to malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=best+alarm+clock+android+2018 In PDF document text
    • https://cdn.sqhk.co/fubebevukad/ijdjeid/24318279624.pdfIn PDF document text
    • https://site-1212380.mozfiles.com/files/1212380/christafari_songs_free.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/pavuzajalodewe.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/widofafane/43985352297.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/avast_antivirus_2018_exe.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/crossword_puzzle_clues_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/akuntansi_keuangan_menengah_berbasis_psak_buku_1.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/geologic_timeline_eras.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/ball_blast_99_voodoo_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/33321715678.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/89438271695.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/bopemanozesuxosetenitofi.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/terokapiwudud.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/wijewurugu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 5720 bytes
SHA-256: 51311d65183eecf8aee973b6ea2bd418e6844860f4a3b19c877ff9e6d49928b0
font_01_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 10724 bytes
SHA-256: ffd6eb08304e06ec369e79147ef44329f91f0346e09198568d9a76e7314b548c

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