Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0090d8825d52a2…

MALICIOUS

PDF

73.5 KB Created: 2021-05-30 12:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4bd8eacb64825da8e138723544f39277 SHA-1: c79c3f00df8d91daac3a85cbbdb6bf19ba735216 SHA-256: db0090d8825d52a2fb0e2aa19b3d4263dbd882f5b6199f643b2295113011e8f8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the use of JavaScript for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://zajinet.ru/123?utm_term=lease+contract+template+texas PDF link annotation
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/fawuwoxefatol.pdfIn PDF document text
    • https://wixozini.weebly.com/uploads/1/3/4/3/134383912/mixalop.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/lutugikez-zamevanog-nunoz-diwamex.pdfIn PDF document text
    • https://verobegami.weebly.com/uploads/1/3/0/8/130814611/1017649.pdfIn PDF document text
    • https://lexutadi.weebly.com/uploads/1/3/4/3/134377716/44467.pdfIn PDF document text
    • https://wenupenowabivak.weebly.com/uploads/1/3/7/5/137513408/4685bb986022.pdfIn PDF document text
    • https://fobunimo.weebly.com/uploads/1/3/1/4/131407012/duriziputi_pumapadonu.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/gaxukow-kuwutuf-pidejiroza-fafuzivujetiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcbcd51f-28a4-4101-bb6d-0efa9913ae7d/cassandra_clare_chain_of_gold_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59d427c-58fd-4035-9c85-6426fe657481/karefapaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfa5a7b-5612-4ef3-8761-53ce9e4a5148/seth_godin_the_practice_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e7ae49-6c39-40cb-9f68-00ea779ffe75/64301595046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf0bb87-2abc-4f60-a9c9-5dbc79fe8ca0/who_is_the_voice_of_zero_in_mandalorian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936fa7d2-5da2-485e-b045-1c0a65e986e2/zilegomori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bbc8c5-5bc2-4f46-afb1-077cb296b8bf/18357182200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42892b67-cf27-449b-8cb4-c9b125adb9cb/xutugedego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5605956a-fdd3-46ba-b9eb-ac80328ee588/sizupoxizepusosebodaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4fe393c-f564-49af-b8a5-7314d32c6d1d/16022730527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/812b473f-a521-4978-8275-0d1c7bf3cd4b/21519960833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c510c066-1066-4195-b41b-9510bb9086f5/how_to_pay_restaurant_servers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a1f7cfe-a3ea-4d6d-8750-2c4770017dff/gijavatelisufikogesafoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37dde43d-0bf0-4c84-92ec-282ddeb2e608/55337991076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2615cc62-db3f-4c1b-9fc6-89a0de1ad457/french_grammar_lessons.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_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 5088 bytes
SHA-256: fa57913e1600a5a98d07f9b1e75d5f043aac5a9f130e216b2fc7b64e6217a1e0
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 10864 bytes
SHA-256: 0914a74eb9e3a56dda07a76fb13624b81a727f55e7e096bf18e116978626a725