Malicious PDF — malware analysis report

Static analysis result for SHA-256 708ff54a5dd4f1bc…

MALICIOUS

PDF

70.7 KB Created: 2020-12-20 10:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d553cfafdf3bdd74c9a9082824477bc8 SHA-1: 8a846d9f33716993ffcb8ccbfee847782a7c49bc SHA-256: 708ff54a5dd4f1bca75d71ad2f617f1d92c940ecc55a3e96c0a1ca410fad4b4b
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'Gilmour 9100 water timer instructions'. The sample also exhibits characteristics of a link farm hosted on disposable domains, further indicating a phishing or scam attempt. No scripts were extracted from this sample, but the presence of malicious URLs and the ML classifier's high confidence score strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=gilmour+9100+water+timer+instructions In PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/finupawag.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/pasis.pdfIn PDF document text
    • https://sorozodosunew.weebly.com/uploads/1/3/1/3/131381031/sogibagetol_veturazodetosa_pezojen_wawefosanagud.pdfIn PDF document text
    • https://kupajozowujuz.weebly.com/uploads/1/3/4/8/134881722/zudibejij.pdfIn PDF document text
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/zomiz.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/pexorili.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/farowug/18603811783.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/4506403197.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/diablo_3_season_17_power_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/lagu_salah_apa_aku_cover_wanita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52547f94-d10e-4988-a28b-bca61fcf8dcd/volume_of_hard_disk.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/gujarati_balgeet_hd_video_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB035 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000ba79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA79 5420 bytes
SHA-256: 150c3bcc85f0cec87aaf83242b0acfb866d810c12ee2ab8fc476f406d2b9a2c7
font_02_sfnt_off0000cce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE3 13308 bytes
SHA-256: cd53f42696bd88dd0ed5e0b396da408c06af5e5d2539905e3034018b6774c407
font_03_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 16164 bytes
SHA-256: b21434860209bcfa4faa45743010641f853ea3cc1b0bad42541eb31f339e130c

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