Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d77dfb07b0dfa0a…

MALICIOUS

PDF

76.8 KB Created: 2021-03-17 03:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b602496fae19a46ba7aba1fd0221a620 SHA-1: a91980e368e1cf02d246adbe6bb7297af5967719 SHA-256: 7d77dfb07b0dfa0ab1109554da1e40b1a63942cb308bf8bf319fa675f76fda1d
186 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' and the ML classifier's high score indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/wix?keyword=getaway+plan+2016+parents+guide PDF link annotation
    • http://mastera-saydinga.ru/30_minute_yoga_routine_for_beginners_youtube82lk5.pdfIn PDF document text
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/pakorataruluz-buxutizer.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/38497380864.pdfIn PDF document text
    • https://livupojinobiz.weebly.com/uploads/1/3/1/8/131856358/4673557.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/sudub_kisowune_varevif_relegov.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/myles_munroe_books_waiting_and_dating.pdfIn PDF document text
    • https://kemumapuvepuvi.weebly.com/uploads/1/3/4/3/134311950/jajukokide.pdfIn PDF document text
    • http://liketime.online/dodge_dakota_parts_catalog90nax.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/ripujuvoru.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/1224813.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/7057212.pdfIn PDF document text
    • https://tipuxefisabe.weebly.com/uploads/1/3/4/8/134846761/lafele.pdfIn PDF document text
    • http://golden-bridge.pro/how_to_write_a_mathematical_induction_proofa0ofa.pdfIn PDF document text
    • http://xoxapepagaxon.mypressonline.com/surrealism_in_english_literature.pdfIn PDF document text
    • http://zovitidagawas.sportsontheweb.net/alternating_current_class_12_formulas.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/vajijiguf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_189cbcc878dd4214b85f6cb59ce28d95.pdf?index=trueIn PDF document text
    • http://pevipitoz.atwebpages.com/adverbs_of_time_quiz.pdfIn PDF document text
    • http://ruzakema.onlinewebshop.net/26676332981.pdfIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_416dd766d4244b2d875e6a8b96c90822.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_72f990e1d87c4a79b017c4ff30f88f22.pdf?index=trueIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_542cf5b1826742d095928969bf595bf9.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_b9780a9f44cc4e6a887710e2bb8ca4d3.pdf?index=trueIn 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_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 5832 bytes
SHA-256: 03f4b41ed10492e256c95198371f2226fb7eb129463a29509e2d51371067a238
font_01_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 10824 bytes
SHA-256: bae25c082459e84c50d861426ebf49ec03bd03f79d6708bd5ef555cfcac098ae