Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c935e743e26ea4…

MALICIOUS

PDF

80.9 KB Created: 2021-03-19 17:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4dfbbec1a6fb48a33ddcf751ee83c5d SHA-1: 7d845a0b1f894576c90e6a94045fcccf0cd17ca7 SHA-256: c7c935e743e26ea4344c72232cdfb0434652065379b827660b937df404f2739c
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://seumenha.ru/wix?keyword=geekerella+pdf+indir+t%25C3%25BCrk%25C3%25A7e
    • http://ibkreactiva2020.com/saltwater_tank_setup_for_beginnersh16hb.pdf
    • https://lawebigatu.weebly.com/uploads/1/3/1/4/131453175/sizadixa.pdf
    • https://cdn.sqhk.co/ludukuni/FjaQcck/37548140922.pdf
    • http://vanimerukaguto.scienceontheweb.net/fitujiginu.pdf
    • http://manthoughtswebsite.website/estilo_de_vida_definicioni0s43.pdf
    • http://pasikufopubiwo.mypressonline.com/modo_de_produccion_asiatico_caracteristicas_sociales.pdf
    • https://zawanudodulir.weebly.com/uploads/1/3/1/4/131452903/zutexebabisitas.pdf
    • https://guzokilib.weebly.com/uploads/1/3/2/7/132741743/4868936.pdf
    • https://cdn.sqhk.co/pimibopugugo/s2ggoij/63852021130.pdf
    • https://cdn.sqhk.co/zibumimuw/Whjjcck/nozekidetevug.pdf
    • http://nizavevorupuj.mywebcommunity.org/79767177034.pdf
    • https://cdn.sqhk.co/naliwanik/hfgeqTU/35501751221.pdf
    • https://cdn.sqhk.co/xoxapivasif/e4jbYgg/find_friends_nearby_snapchat.pdf
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/duzisevonu.pdf
    • http://torchland.xyz/anamnesis_muntah_pada_anak438ay.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bb792f84-60dc-46e4-9ebf-6cf37c81469f/41852624139.pdf
    • https://s3.amazonaws.com/zebarufuridorur/3813569871.pdf
    • https://uploads.strikinglycdn.com/files/5af7ded3-4f15-41fb-9848-2d2de33b2127/miziw.pdf
    • http://nunavaxukozu.onlinewebshop.net/64712478677.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/27172065400.pdf
    • https://s3.amazonaws.com/goviwigax/25227160317.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/88772152384.pdf
    • https://uploads.strikinglycdn.com/files/c6371e3f-800d-4ad6-befb-466b403b4cfc/how_do_i_turn_off_call_forwarding_on_my_att_landline.pdf
    • https://uploads.strikinglycdn.com/files/1ce66101-9f0a-4a76-a967-da58b7b5ab63/69706771348.pdf
    • https://s3.amazonaws.com/gadumagabusodel/78758740500.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee45.bin
a240ef46e2a876d34add416ecc94d5e23284962b2ea647319d080f82e2b9f218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 4932 bytes
font_01_sfnt_off0000ff20.bin
925986eee1d2bab26ab64926c4656e5d1285f15d5d552a1eea54a3060b8bcd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 12380 bytes
font_02_sfnt_off000125eb.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 4324 bytes

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