Malicious PDF — malware analysis report

Static analysis result for SHA-256 797c8b6c5e8db983…

MALICIOUS

PDF

62.9 KB Created: 2020-12-16 10:53:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 233a0fbb6588a164aa92f1631196d4d6 SHA-1: 2a9bfe39de32e46f24a5615864bb8d04f0a4537d SHA-256: 797c8b6c5e8db98322933bbb8e08fda9fc0d8adc09582ac2e91b2d1ebfbb30c7
214 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links. The embedded URLs suggest an attempt to direct users to potentially harmful websites, aligning with phishing or malware distribution tactics. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=the+compound+microscope+worksheet In PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/xarujesu.pdfIn PDF document text
    • https://lowarimubabop.weebly.com/uploads/1/3/4/7/134712264/e51bd62fef29.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/5fc5d7b37848ba205d3ab541/t/5fc99583e4017829c16363c2/1607046532329/the_fear_creepy_scream_house_3.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/28174313449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357fca4a-cc27-4bc8-a504-35710e50a51f/magazine_release_for_ruger_mark_1.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce34e9790d063a90a99d52/t/5fd669935488895576ac9737/1607887252023/microsoft_office_2011_crack_for_mac.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6e38f8c9e503d27a65431/t/5fcea0ee866f6d0e8695a372/1607377134040/narorug.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd04fdb4c4d833b8bec5aa/1606223102750/76591072028.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc16c877848ba205d1c3861/t/5fc60b0ef81c9a2a0c72d3b3/1606814480282/27036786720.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf68ea9d7936484086726c/1606379755344/kirito_ggo_minecraft_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f924add-40f7-4e86-be22-4060b3f7eb6f/circuit_analysis_theory_and_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8fae43-19a3-493b-8338-2eebd62f5455/lange_s_handbook_of_chemistry.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_off0000bb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7B 5176 bytes
SHA-256: 3919b8dbe002360bf006517fde19f9e845fb386db19b2cd0e2ca613731038c83
font_01_sfnt_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 9800 bytes
SHA-256: 0deb1a4ac0d2787e78cbb1bc5bb3bc1104e501b2f00cea3439f3206ae785ed4b

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