Malicious PDF — malware analysis report

Static analysis result for SHA-256 d305359d71178ddd…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 01:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 62ebc4d7c6b0695cd24574e09d7f2e35 SHA-1: beb60e7dca49d6a19bdf66ff1c0d2daf24efd4d4 SHA-256: d305359d71178dddea65560219226c9995e4252736cc66e6a1fa8ab3436a3b8a
192 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The presence of a redirector link to 'yafferge.ru' and numerous other links suggests a phishing or malware distribution attempt disguised as a software download. No scripts were extracted, but the PDF structure and embedded links strongly point towards a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/award?keyword=pdf+to+jpg+converter+software+free+download+for+windows+8.+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418755/normal_6032e7bb441b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_603c036d7b0db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367000/normal_5fdd2edc9a648.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/ggAzPgg/78933180255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460706/normal_5fccf64de8e49.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/gegcgdQ/14394836683.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/5jahzpT/57110163634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://witigunakejawi.rf.gd/zopokufolopes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b350da-bdfb-4ddf-8110-4df3fed78ec9/how_to_write_a_case_study_brief.pdfIn PDF document text
    • http://fizuvofodiku.epizy.com/22901466580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91406d4-fab8-473a-8661-d256e629be99/mtd_snow_blower_auger_belt_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6034bd31-3267-40cf-9f12-2a4190694425/8473256464.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/85044670840.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/92311969622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0936e45-1107-404a-bd35-961833ffb583/fowuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c9e9aa-7ed8-4c77-8182-294f6139da5a/how_to_meditate_to_attract_love.pdfIn PDF document text
    • http://fafanuzumamowaz.epizy.com/where_can_i_donate_unwanted_clothes.pdfIn PDF document text
    • http://xeregolipota.epizy.com/66848069141.pdfIn PDF document text
    • http://fomidofuwonuw.rf.gd/gigexabibipixikusibitojit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c051a3-853b-4791-909e-350c29cd2111/28421253485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b868ba13-734f-42eb-8a14-7a2634c1c5c5/sergio_carrasco_diaz_metodologia_dela_investigacion_cientifica.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_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 5828 bytes
SHA-256: b3c8978aaf13d8d55f6c00bc95f1e3f67d9dbaaf6397995c6837826519664d7b
font_01_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 10568 bytes
SHA-256: 7fef274790cc8e7806a0cf1ebf9daf15c8b25228ca387024410a7c0ea66637de