Malicious PDF — malware analysis report

Static analysis result for SHA-256 da56ba4877841fd1…

MALICIOUS

PDF

79.3 KB Created: 2021-02-23 13:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c0b88439d376241853f26cdcff99ae42 SHA-1: 37a0bfde3d54fc811ee83d33cebc1445aeae0756 SHA-256: da56ba4877841fd1053515776c79790a377cc5b4a87de3cc7897469ec961cf5b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=winter+2020+outlook PDF link annotation
    • https://roxodebovak.weebly.com/uploads/1/3/1/4/131454305/pugokowopirazel.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/A8Vhhgc/rovusegijum.pdfIn PDF document text
    • https://pakimisubimoge.weebly.com/uploads/1/3/0/7/130776027/1fc5e57f3.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/5a0431.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/hh0idYL/city_2048_cheat.pdfIn PDF document text
    • https://begosibaluta.weebly.com/uploads/1/3/0/7/130775163/ba8e8c9be76.pdfIn PDF document text
    • https://legadiduzavof.weebly.com/uploads/1/3/2/6/132681829/4878ea21c0.pdfIn PDF document text
    • https://jevupatumatawi.weebly.com/uploads/1/3/4/3/134377955/3265723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389361/normal_5ff120b78c462.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/Bhd1hdw/dubai_covid_cases.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/fKhfhip/truck_wallpaper_for_your_phone_pictures.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5fffeb7cd4dd6.pdfIn PDF document text
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/jixizuro-jufixu.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/bezutu/3725044750.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/clash_of_clans_th12_base.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/the_executive_superannuation_fund_withdrawal_form.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_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 4640 bytes
SHA-256: abd261562c8e2f9f1ca380f0b666ad9f5b7791e95bd3cbb5767c3389ecb89710
font_01_sfnt_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 10944 bytes
SHA-256: 6d87c83623d84926618cbc7f152844737d9a9344c793392f3f40f2912f559b04

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