Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2d329eccce443e…

MALICIOUS

PDF

79.7 KB Created: 2021-04-08 08:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca2343ee1418f129fab04d85b151f864 SHA-1: e19fa78a8ef4ad0668a76e169d93dd5d0466d8df SHA-256: 7d2d329eccce443e8f1da44a2574a880c4c7b487769d0c8076e5df1d0067a847
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic and ClamAV detection. The primary malicious URL identified is resalured.ru, which is likely used to host phishing content or a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=do+androids+dream+of+electric+sheep+omnibus+pdf
    • https://cdn.sqhk.co/dedikunakudu/fgggi0C/71890818161.pdf
    • https://cdn.sqhk.co/miloxuso/ejcTig8/jepuxotidizisusogug.pdf
    • https://cdn.sqhk.co/gitovera/fvvPihZ/ikea_dresser_recall_list.pdf
    • https://cdn-cms.f-static.net/uploads/4425511/normal_602d43a5c8ea5.pdf
    • https://cdn.sqhk.co/dodiniwotud/7Kicupt/tasibazibilurororobez.pdf
    • https://cdn.sqhk.co/wofazexej/hj4Ojjh/ribovufirure.pdf
    • https://cdn.sqhk.co/nokotadi/bDDmfgi/38207236205.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_6045c69b065af.pdf
    • https://static.s123-cdn-static.com/uploads/4470207/normal_5fc6cf6f4901c.pdf
    • https://cdn.sqhk.co/liregagibago/8Aybajg/5098658808.pdf
    • https://cdn.sqhk.co/wibetaxor/ohclUjd/kathy_rain_walkthrough.pdf
    • https://cdn-cms.f-static.net/uploads/4424040/normal_5fd78893c3fab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/getizar/are_ninja_blender_bases_interchangeable.pdf
    • https://uploads.strikinglycdn.com/files/d3d3018b-122d-4723-945c-c7af63eed2ae/7129595624.pdf
    • https://s3.amazonaws.com/jivala/toxicology_report_cost.pdf
    • https://uploads.strikinglycdn.com/files/727a96e5-0586-474b-8c7e-3e3b4070485c/67155554544.pdf
    • https://uploads.strikinglycdn.com/files/a813b23a-b39f-4005-a02b-ec092878bd15/what_is_the_meaning_financial_loss.pdf
    • https://s3.amazonaws.com/pusixa/wrong_turn_7_trailer.pdf
    • https://s3.amazonaws.com/xefejevife/accurate_heart_rate_monitor_apk.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_b897c81aca154428b0a63b6c69f9c6bf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/98ce0b8a-43cd-4101-a833-a9a54f5ec3f8/76896389835.pdf
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_3d9349dd291c48e59f4295a94b6f63fb.pdf?index=true
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_2d6f46e2b6124c48b95862f290cb80ec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/334213ea-a5db-4dbc-8ecd-a18432b0ff7c/16246637062.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66e.bin
d78554d9b5eb74d8b37d5b9266e551e2e67c261a1c71911738a4783e7b976641
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 5532 bytes
font_01_sfnt_off00010915.bin
90469f6d1a0d87c941195abeed50ebf2b626d19ce995a7ed07a07e4fd7bea582
pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 11680 bytes