Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b8d983a8974079…

MALICIOUS

PDF

73.3 KB Created: 2021-03-25 11:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e3dac957fb233941192499411b9c5f60 SHA-1: 49e49ce028b78b6e09e7f513325d4035f7e11d57 SHA-256: 85b8d983a8974079b5da164a5a131ad47ed68b0ab489e0736853c1250818d69b
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious. The embedded URL, 'https://resalured.ru/strik?utm_term=why+is+my+honeywell+pro+series+thermostat+not+working', suggests a lure related to technical troubleshooting. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards a phishing or malware distribution 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://resalured.ru/strik?utm_term=why+is+my+honeywell+pro+series+thermostat+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443344/normal_602b08ed421dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410459/normal_5ff7ce1e8f576.pdfIn PDF document text
    • http://mabay.fun/adada_velicham_vanthu_song_karaoke0ibp3.pdfIn PDF document text
    • http://lnstagramoriginal.com/the_land_of_stories_book_1_audiobookm9i7p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5ff7c485349d1.pdfIn PDF document text
    • http://excschool.ru/88937169401rqcyl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fd6e02452c50.pdfIn PDF document text
    • http://7lessons.website/kupaxuzileti1axf.pdfIn PDF document text
    • http://sis-paypal.com/vonefopodiveo3j.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/xixonu/buick_verano_2017_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ba9291-d5fb-4904-9d17-f4ac14012c74/skyrim_official_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/hp_officejet_4500_scanner_not_working_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/tica_a_nicmaco_aristteles_livro.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/maneuvering_board_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb66f3c-f6a5-4c43-aaba-84bdaaf46b51/71715138120.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/66323452872.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_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 5504 bytes
SHA-256: 6702ba8a40d151ec3ba27a7199420851518da7c0510fadbad12b58c4e21ec743
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 10240 bytes
SHA-256: 12127b1b80c91b5b2e244eefc420b780dad26de26383c3a0588c7f1b984ead4c