Malicious PDF — malware analysis report

Static analysis result for SHA-256 1803e18e0af3440d…

MALICIOUS

PDF

79.2 KB Created: 2021-05-31 09:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1cf47ceed486f95f76de448fb9f71930 SHA-1: af2857aa0e46a643de3f184004ff1c5211c48b47 SHA-256: 1803e18e0af3440d8db926b8d98b7641039ac0816f6d2203fcf2262a278e1806
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains a lure related to fixing blurry photos on Android, but its primary function is to act as a link farm. It directs users to numerous external websites, including known malicious redirectors and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://dafemum.ru/strik?utm_term=como+arreglar+fotos+borrosas+android In PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/7863688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_60446bc78d85d.pdfIn PDF document text
    • https://jevuzukolusiwu.weebly.com/uploads/1/3/0/7/130739503/gekedekisesuginir.pdfIn PDF document text
    • https://lolaxazexujobiw.weebly.com/uploads/1/3/4/7/134762367/godomotibamivojes.pdfIn PDF document text
    • https://jugoneworo.weebly.com/uploads/1/3/4/3/134307205/bosanelituxowibavoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_601fc4daa034c.pdfIn PDF document text
    • https://xasibegofijuga.weebly.com/uploads/1/3/4/7/134731363/mugegasabixujutedal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_60295ac968f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_600f5f27ad331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480745/normal_603c4faf11580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_606a65c66f705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5fe6a91fdd817.pdfIn PDF document text
    • https://bitilidejiv.weebly.com/uploads/1/3/4/4/134442737/4177522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_603956cc77e13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a0e07a44-e61b-437d-82ab-1b6633d57969/jutof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0959cd60-b0a3-406a-b4b4-bdbbfd58e6f4/taxulotexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf21eae1-dab4-4b15-9a5f-8a709b63e5b0/98177588991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c014d29-ebe2-48a0-86d3-40d5f9891d40/571686965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2fc93d5-a2d1-41d9-90a6-4766e6158da4/48000733440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1d06b3-e620-4458-9898-e561f48543be/does_brother_mfc-j775dw_support_airprint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d155c7-e705-4f62-97ee-e1b124d8536d/mcas_math_reference_sheet_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287b2da6-8160-4cde-b8c8-5cdcaa6c9cb5/tutidufonobekakovutorimo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 5176 bytes
SHA-256: d5adb217eb56b8a5031e79fdc034a5528bf7c03a0db662c2f6b8f0e344bc9fac
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 11612 bytes
SHA-256: af7e7f4ec5c35e033202215398bd47be8e01ced5ef6556b3677cf73ae8c5a301
font_02_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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