Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f35b4ac0f49f02…

MALICIOUS

PDF

73.7 KB Created: 2021-06-08 00:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5d378e361b4e6fce1918c0ddbf690484 SHA-1: 9d3c83e43b4422250c9b1163fd9001e14e3e9488 SHA-256: 14f35b4ac0f49f02f61062e54fa355e433ff17290ee2181f554dbae5eeb211ee
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's used to distribute further malicious content or lead to phishing sites.

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
  • 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://chcial.ru/pbw?utm_term=libro+historia+2+secundaria+pdf PDF link annotation
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/1079215.pdfIn PDF document text
    • https://warujupegam.weebly.com/uploads/1/3/4/6/134687544/gujibejen.pdfIn PDF document text
    • https://fubediko.weebly.com/uploads/1/3/1/0/131070718/bibuko_faxitaka_tonuzilopol_daderedizuv.pdfIn PDF document text
    • https://kokarino.weebly.com/uploads/1/3/5/2/135299240/natiwaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5fdd98af886d5.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/xaxevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487187/normal_601ba3ca6140b.pdfIn PDF document text
    • https://zarekekokubudal.weebly.com/uploads/1/3/1/3/131398532/puteruviziravi.pdfIn PDF document text
    • https://rosujukasawi.weebly.com/uploads/1/3/5/3/135301647/dativopepatonufenup.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/xowagukezonawiv-zigijunod-dilaririnabenil-fasavedasasonos.pdfIn PDF document text
    • https://jemijibiwozigep.weebly.com/uploads/1/3/4/8/134855884/f2be11114.pdfIn PDF document text
    • https://rerevuvin.weebly.com/uploads/1/3/4/5/134524399/1087181.pdfIn PDF document text
    • https://jawejeletisib.weebly.com/uploads/1/3/4/8/134886371/fdddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_60b8332f3f914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_601889a5688da.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4375070/normal_60b764ad88180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_601e5fe01ad5e.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/fimajoxofe.pdfIn PDF document text
    • https://widawukilifuduz.weebly.com/uploads/1/3/5/3/135398171/809090bd4e4da.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
    • http://numefen.pbworks.com/f/gotojeko.pdfIn PDF document text
    • http://majemekux.pbworks.com/w/file/fetch/144798933/how_to_day_trade_for_a_living_aziz.pdfIn PDF document text
    • http://zogekinovag.pbworks.com/w/file/fetch/144455946/22634447720.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_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 5304 bytes
SHA-256: 14874867e21e8af78393724b3bf279bb0dce5d8f713167435325082f340fd8ac
font_01_sfnt_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 11752 bytes
SHA-256: 8edd88870294848575ec3a6edc44f2c31abf726ca620f16021dd6da8148eae51
font_02_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361