Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c4d41059869919…

MALICIOUS

PDF

80.8 KB Created: 2021-03-14 11:37:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a4e2d2eec09d281929a77f70dcfcb43b SHA-1: 56e805d61065686f64f53ed641aa2dec1d7086cc SHA-256: 71c4d410598699191fe4586626402ae48511ac8e5a0a02f2cff38acc073583e3
166 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, with one heuristic specifically flagging a link to 'http://nominasacra.ru/xoranuvizowirepazavegapitfxfre.pdf' as a random, algorithmically generated URL. The document body, though heavily obfuscated, suggests a lure related to a 'Manual de gramatica 6th edition pdf'. The presence of external links and the nature of the flagged URL indicate an attempt to redirect the user to potentially malicious content, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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://kuzutuzo.ru/wix?keyword=manual+de+gramatica+6th+edition+pdf PDF link annotation
    • http://brumbum6.xyz/achieve3000_answers_the_marvelous_st34wfb.pdfIn PDF document text
    • http://copyrightproblem.com/personal_questions_to_ask_a_guy_about_his_pasts00nx.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/63975777901.pdfIn PDF document text
    • http://edayafar.xyz/why_is_my_swingline_stapler_not_workingixx5j.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/51547719463.pdfIn PDF document text
    • http://ccckkkkk.space/xalujixak81eos.pdfIn PDF document text
    • http://groby-ritual.online/rhythm_strips_for_dummiests0zi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_601b4409f131c.pdfIn PDF document text
    • http://nominasacra.ru/xoranuvizowirepazavegapitfxfre.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_6013441ae4192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485587/normal_6008b2a430774.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/best_assault_mechs_mwo.pdfIn PDF document text
    • http://noverst.xyz/which_timex_ironman_is_the_bestxfftu.pdfIn PDF document text
    • http://ledimpress.biz/cochlear_kanso_2_sound_processor7cf5r.pdfIn PDF document text
    • http://0fruits.space/roxomifevicowjm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420238/normal_604ae9aabda9b.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
    • https://uploads.strikinglycdn.com/files/397fea20-43a7-4201-8f11-2f23397f7c68/how_much_does_dutch_bunny_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b51a00-0ba3-4954-ab41-c3f00d54bcce/83209872249.pdfIn PDF document text
    • http://lazuletezofik.onlinewebshop.net/zolizeb.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/28952004827.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/integrative_therapeutics_theracurmin_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/dress_code_formal_dinner_cambridge.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/50146682378.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_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 5432 bytes
SHA-256: 5c7e8b596a3d522bfe399d00f29c0d000d6edf2eee07148d1181ea8cdd7bde82
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 11568 bytes
SHA-256: 01472dff2be9ce3ceb31bcdc6a819054154578996c6169fe250a885f0ec698ac
font_02_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71