Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba2f253a13e5bc4…

MALICIOUS

PDF

68.1 KB Created: 2021-02-02 19:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6ac89b004e7cc7bb8c9e16719644f806 SHA-1: 7b38d8c02f0d126c3c8c493055561d5d93ad3c4f SHA-256: dba2f253a13e5bc4adfad4b7d11d4e97e9e7b282b4f19de3e6864e39c68ce25c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and a machine learning classifier, with critical heuristics indicating it functions as a link farm for external PDF documents. One of the embedded URLs, 'https://jottigo.ru/123?utm_term=idle+heroes+mod+apk', is directly associated with the malicious detection. The PDF structure and embedded content suggest an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jottigo.ru/123?utm_term=idle+heroes+mod+apk PDF link annotation
    • https://cdn.sqhk.co/nitunoda/jgjfqM4/gigas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499023/normal_600313ecba143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5fd8d4bd1601c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456667/normal_5feafc2e1bcd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403952/normal_600ba9a27c037.pdfIn PDF document text
    • https://gezameluloxeg.weebly.com/uploads/1/3/5/3/135393377/ximokofurude_mawovomis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413019/normal_5fe5e460bcc7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5fdaeef83098e.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/4c49e94.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/iijkpjp/lucifer_tv_series_hd_wallpapers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_60131705233a2.pdfIn PDF document text
    • https://cdn.sqhk.co/befulirawid/pQchggg/bedov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_60192cbb4ffc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/elastic_deformation_of_axially_loaded_member.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/gold_foil_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/raju_bhai_audio_songs_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/new_hollywood_movies_tamil_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/vibax.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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 5200 bytes
SHA-256: 5d8a378ff3e166ae3edaf9899184ef7bb46bb97b5d0f34d1a63864ee13b5858e
font_01_sfnt_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 10192 bytes
SHA-256: 0ec4452eda30378128cb150c81bac585c928e60c553b2ef82f754e301fd930e9

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