Malicious PDF — malware analysis report

Static analysis result for SHA-256 503c15145fc99157…

MALICIOUS

PDF

75.4 KB Created: 2021-02-26 19:30:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b5eb2f74cfb274cd5070417c7da4d8b1 SHA-1: 5eab17c7fe66255c1eeb892cf9bb14516d103677 SHA-256: 503c15145fc991576f7c8287ec48ef1bbfbd7d1d2b7329a82074499123507324
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs, such as 'https://seumenha.ru/award?keyword=where+is+addison+rae+from', are likely used to drive traffic to malicious or spam content. No scripts were extracted, but the PDF structure itself is indicative of a link farm designed to manipulate search engine rankings or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=where+is+addison+rae+from PDF link annotation
    • https://zewerigavuj.weebly.com/uploads/1/3/2/6/132681779/wemakubexeg.pdfIn PDF document text
    • http://olx-delivery.cc/best_names_for_fancy_catsui253.pdfIn PDF document text
    • http://meetchambre.xyz/adecco_group_annual_report_2017l617j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_600011db9b20e.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/6671954.pdfIn PDF document text
    • http://compte-cmbretagne.best/cambridge_dictionary_online_english_arabic1l6ft.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/8ba85fd.pdfIn PDF document text
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/68e6f.pdfIn PDF document text
    • http://fastnoutservice.ru/new_bhole_nath_song_ringtonevu2cg.pdfIn PDF document text
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/8984b30d0b.pdfIn PDF document text
    • http://wdd13.ru/washing_machine_repair_service_costehbu2.pdfIn PDF document text
    • http://lnstagram-helping.live/applied_statistics_and_probability_for_engineers_7th_edition_free_download77hvz.pdfIn PDF document text
    • http://zoomita.space/how_to_learn_korean_grammar_easilyzyxgd.pdfIn PDF document text
    • http://choosenews.space/shark_ionflex_duoclean_if205_partsxjk56.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/xaliwalufoguni/der_liberalismus.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/vujonelewibenifusap.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_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 5128 bytes
SHA-256: 83635783e8ac5456300bcac12dd4ea3352657109737d1055fcc29a22ad7acde0
font_01_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 10624 bytes
SHA-256: 569a0ce3b7bd04d265a8c0117fae495100bfc8f05d860589b9e7241c07d47618

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