Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d7423c0d5ce0e8…

MALICIOUS

PDF

79.2 KB Created: 2021-04-05 09:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2321e6d73d4fa464f683df677d937cc9 SHA-1: 1fb5dd257ac88981128901f7e8aa8e5cbbd2b6b3 SHA-256: 55d7423c0d5ce0e8a65f997e1f8b5f1cbdb27c9622a52e1cfe6d184d507ccce0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URL `https://xezojetit.ru/wix?keyword=ducati+workshop+manuals+online` suggests a lure to a potentially malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic findings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://xezojetit.ru/wix?keyword=ducati+workshop+manuals+online PDF link annotation
    • https://cdn.sqhk.co/vekepafate/iegehfq/wawupisimamifotebuk.pdfIn PDF document text
    • https://wutarodopa.weebly.com/uploads/1/3/4/2/134266687/84129f375f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443608/normal_60176be946bbd.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/giyGNYh/fubazoruf.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/68357553405.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/2hhjggg/fajujuxukudepaj.pdfIn PDF document text
    • https://lodunuvivilaz.weebly.com/uploads/1/3/0/7/130775731/xopeviduji_lurojikonup_roridigo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fcaa298c82d4.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/xejik.pdfIn PDF document text
    • https://cdn.sqhk.co/jivapereb/wCpggia/81647310227.pdfIn PDF document text
    • https://cdn.sqhk.co/miviluwulux/ijZeyK0/36996496544.pdfIn PDF document text
    • https://gilotimo.weebly.com/uploads/1/3/4/8/134899899/6288810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5fd1c3067edde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_605d69d30ddb0.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/hummingbird_depth_finder_helix_9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_603131290e5af.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/sazixipame/how_to_use_contour_next_test_strips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f421d1f-7f9b-48e6-bacd-806257fb377b/korean_words_list_with_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/jnpt_port_vessel_berthing_report_today.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/sinhala_alphabet_letters_with_pictures_and_words.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/98651588467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08023275-a28b-4732-8f6a-7c650cf036ea/49505710009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884df339-f09c-4d17-8305-e5f8fd858fe6/53628024223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1014bf54-691a-4862-8108-3bf1bcfb3f7c/poulan_pro_gas_blower_vacuum_ppbv25.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_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 5328 bytes
SHA-256: b644be0fc2d11a18db8d8d15019802ba40fce4a5827a36d8d8680a4142158d3e
font_01_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 10912 bytes
SHA-256: 458119af52eb7fec2ddfb795a900e779dc179b64aca34b6acadd3b63115c8687