Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3ade5f07d26522…

MALICIOUS

PDF

74.5 KB Created: 2021-02-14 08:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: df6a9aa7692e3dee5182f1b6ec3aa312 SHA-1: 745c1605f725705c4e7e50c516b808f69787d43d SHA-256: ae3ade5f07d26522bf6ecabb86b2605c880d59dd8c0d20b1376f5e0051034fb3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to 'family curse' to entice users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a pattern of hosting many links on disposable domains, common in phishing and malware distribution campaigns. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=how+to+take+off+a+family+curse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480403/normal_600c7d62e60f7.pdfIn PDF document text
    • http://puveduxorapuba.iblogger.org/xufogi.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/d0691.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/56395548527mazom.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/723e7.pdfIn PDF document text
    • http://desekikimok.22web.org/62198172277.pdfIn PDF document text
    • http://napelafaromoj.22web.org/bigasebovad.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://mivuturirem.rf.gd/17421021829.pdfIn PDF document text
    • http://sewewixa.epizy.com/happy_raksha_bandhan_song_mr_jatt.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/40656965491.pdfIn PDF document text
    • http://bivagunipekuja.rf.gd/rusafejetezutofesixagaziz.pdfIn PDF document text
    • http://vugofixev.rf.gd/gorukel.pdfIn PDF document text
    • http://zakivijojinikij.epizy.com/43661753593.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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 5024 bytes
SHA-256: e27e635420479962e285ba6d909a504d113e807fd695d0dc5f4739229aa3a696
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10008 bytes
SHA-256: d1b5e5b2a7d5102ab38f013771a5084acd843aa60ded733a0137d2fc9b5d36f2
font_02_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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