Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d5f71eaf4f1e1b…

MALICIOUS

PDF

97.7 KB Created: 2021-05-15 09:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dc3d96a6f7e74cb8fb949e132e43725c SHA-1: 317e23f76fef50d3744b63261747dffa837b35d9 SHA-256: 38d5f71eaf4f1e1bc9f018040dffd44ce81948fe53b0445860c1a4a49e9133f3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lozipotod.ru/strik?utm_term=what+does+prevailing+wage+mean PDF link annotation
    • https://cdn.sqhk.co/bisuligiga/gkhgAhi/14330134611.pdfIn PDF document text
    • http://kebunuwuzev.22web.org/calligraphy_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_6060e6963d757.pdfIn PDF document text
    • http://tesepaxe.iblogger.org/sadonu.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/37986371668.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/66543311260.pdfIn PDF document text
    • https://cdn.sqhk.co/dinokafoxume/hJOicM6/40267569237.pdfIn PDF document text
    • https://cdn.sqhk.co/jigekuragige/f2mmTrJ/zidomazubuvina.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/wihhdti/tasty_grilled_blueberry_pie.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/fodmap_liste_des_aliments_autoriss.pdfIn PDF document text
    • http://gasolotiravizid.sportsontheweb.net/pdf_file_to_word_doc_converter.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/gjfTieD/kpop_girl_group_twice_news.pdfIn PDF document text
    • https://cdn.sqhk.co/lixetajetevu/cjcFudD/acha_chalta_hoon_ringtone_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/hbhqYsj/88374538505.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/apa_style_of_writing_references.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485568/normal_5fe76b1cee102.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/jttsjfu/amahitamo_by_social_mula.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/dgeOPEt/gifanogujofune.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/ejavPBh/the_academy_the_first_riddle_apk_obb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fiforeru.atwebpages.com/58263098978.pdfIn PDF document text
    • http://sokagozu.rf.gd/73626829728.pdfIn PDF document text
    • http://donaweraketo.rf.gd/kovamexaxak.pdfIn PDF document text
    • http://rerofasebig.epizy.com/navy_eval_fitrep_writing_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13263 5324 bytes
SHA-256: a76513cc61422c68be1187ec1fa0889c24b1265303acdbce5facfb171e35b4e6
font_01_sfnt_off00014470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14470 11436 bytes
SHA-256: d4d2efcf86a1ffd7ae0080f75e5f69d5b576ca150e3a5eefa147fa99fc217592
font_02_sfnt_off00016b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B20 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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