Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0039025bec25efa…

MALICIOUS

PDF

76.0 KB Created: 2020-12-13 14:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5c614e91abb2fe2c6fde7ec4692ec068 SHA-1: 1d80f35b705d1742a66578ca02c149b5ad1dc2f6 SHA-256: a0039025bec25efa334937e5814ff2628581d80dbc39c88075270cfc5f4523a3
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics as malicious, specifically for containing links to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious redirector URL suggests an attempt to lure the user to a harmful site, likely for phishing or malware delivery.

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/123?utm_term=heart+block+acls+treatment In PDF document text
    • https://vonizimawat.weebly.com/uploads/1/3/4/3/134385064/ridulagomogepakib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc101809698b02c7f2130ce/t/5fd109bbf3421f1f732938d6/1607535036251/pebuxajewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4058de5f-fd34-41d9-8d5d-6b2566bb3d17/bengali_baul_songs_mp3_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/fumopoxurakagajixufab.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/phenol_chloroform_dna_extraction_principle.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1d3b3f9866f3fd2dadad4/t/5fcd9b48920f47545baefe46/1607310153234/jijevesuxatiwutesilib.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/aadhaar_card_form_gujarati.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28f8b40f1034a5cb380cb/t/5fd1f6fc8185f4776a11a0c5/1607595773572/country_music_stars_of_the_80s_and_90s.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/bowujudev.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/14905131672.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/gixuxadasinijeni.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/helicopter_tour_los_angeles_cheap.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/68753811653.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f171c14dfd36fef1b44e/t/5fc833507ff5a343ebec6fde/1606955860794/foxixavojidesudixug.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10620bf71053ccb10dd13/t/5fc1da7761e25426e17bef1c/1606539895601/9921333700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156f04ea-c387-44c2-b296-86a4012ed286/11787227034.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_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 5112 bytes
SHA-256: c0583f307ca33046e6279508a84750776a0f6ce1a2bb395f98ae18da4740ab55
font_01_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 10824 bytes
SHA-256: 948b7af4ea5233bce44de20fa7e83e748d0da6e153457ba9342eeb522e8802d3

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