Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5777d374b4a646…

MALICIOUS

PDF

77.0 KB Created: 2021-05-27 22:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 87a31c1745e3f316fa952ef30af4816c SHA-1: 514d9c845dc31ef1370b43ed2c320b542227c2aa SHA-256: 8a5777d374b4a646bb6b816283f644beee0b6e646fcea981a68c4ff67d0cfdc9
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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
  • 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://vilenefex.ru/strik?utm_term=vidmate+apk+download+latest+version+2020+apkpure PDF link annotation
    • https://fukajupiboxa.weebly.com/uploads/1/3/5/9/135973929/0de777ef2ecbd.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/vikuso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490534/normal_5fcd656e95a00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456369/normal_603e5cbc91ac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_606d00bd75cf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_601e3b2a28ef3.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/rufagevarigewig.pdfIn PDF document text
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/fofakipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_6069c54909074.pdfIn PDF document text
    • https://fenipedixov.weebly.com/uploads/1/3/5/3/135385823/ranigamef.pdfIn PDF document text
    • https://komiwego.weebly.com/uploads/1/3/2/6/132695384/5240943.pdfIn PDF document text
    • https://mibigadoguful.weebly.com/uploads/1/3/4/7/134759919/a62cf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445550/normal_5fcc8d512dc05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448331/normal_5ff77b49cf84c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388158/normal_605a16d491940.pdfIn PDF document text
    • https://damapedev.weebly.com/uploads/1/3/4/5/134576203/d96efad7211928.pdfIn PDF document text
    • https://midinomuxew.weebly.com/uploads/1/3/5/3/135391973/jujewup-golujobivubu-sekobenivopisi-nuwazuvu.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/b8408283-3f09-424c-ac09-4743fadae0ed/duxisavevumamusegejezijog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45be18ac-a046-4feb-b877-bc5b4839bb03/vudobezuxodamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc92a924-17c1-4450-8581-d6f49b559de4/2385464349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d427e4-6847-429a-897a-8748f4d393ed/77603216504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d502744b-f59a-42a1-afb1-2c5789a49875/wolves_of_the_calla_chapter_summary.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_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 5560 bytes
SHA-256: 0d357cf3e3fbc3476f9f5386422abf9d6d6b4bc23256f0989d53d4d9e7d8da14
font_01_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 10724 bytes
SHA-256: 783ed78a7028ec5c77abfaf403fad3a5da1a596f7a2313a467a3969b96108a03