Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c639643829ad531…

MALICIOUS

PDF

70.6 KB Created: 2021-04-05 15:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2198d4242fc7133f2ed8cbecc259f11a SHA-1: fd2ffd93c5e6cee71c97253ff8003dde521e990d SHA-256: 1c639643829ad5317fa063951f0d6ff7a15a0cee9f65c317061fe0eeedf1c1e7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://resalured.ru/award?keyword=physical+science+concepts+in+action+pdf', is likely part of this scheme. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=physical+science+concepts+in+action+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471240/normal_60247cbccbf27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_603d7e569a850.pdfIn PDF document text
    • http://domavera.ru/six_of_crows_series_netflixrylk0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_60258df5237a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_60540c2cb5a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fe6fd0006c87.pdfIn PDF document text
    • http://fitness-ital.fun/java_mcq_with_answers_free_download73sw2.pdfIn PDF document text
    • https://pozukelemiku.weebly.com/uploads/1/3/2/6/132682282/f4d8479c89cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5fd961cbb4fbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5ff345623d596.pdfIn PDF document text
    • http://test123test.xyz/46551602304d4j3g.pdfIn PDF document text
    • http://spencermcman.us/the_chronicles_of_narnia_the_silver_chair_castrh45k.pdfIn PDF document text
    • https://tizelizenofus.weebly.com/uploads/1/3/0/7/130740364/motivizizukun.pdfIn PDF document text
    • http://xefopuro.mypressonline.com/certificate_of_origin_of_the_people_s_republic_of_china.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/e2b9bac5-026d-4c37-9929-caf6f579f75b/99344407410.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/what_is_child_of_god_in_hebrew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f97f4f-770c-4d5d-8aea-6e6e6ee40382/kuninogitanojixun.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/grohe_kitchen_faucet_installation_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c92c72d-2774-4c85-8a40-9d9576b78563/46619764664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4ffb74-9ea6-465a-a921-5eebebdb8242/do_holmes_air_purifiers_produce_ozone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154c4f20-edc0-46d0-acd1-18c4dd3182f1/18042420071.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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 5248 bytes
SHA-256: 34551258c8e260eba6c5be72919551330819961e8981915f7a76f5259d83b104
font_01_sfnt_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 11180 bytes
SHA-256: 2fe80ffb9895a747f837396cb278a957350d761816588c01d1077b76d8a8863d