Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dd0b819da76717…

MALICIOUS

PDF

93.3 KB Created: 2021-05-18 17:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 01cf0cb578f3898cede40fcbd3231e84 SHA-1: 4bef0da6dfd7c33c64170bea91cece6ebb094c50 SHA-256: c9dd0b819da767174a87f93f142f4ae929c43ac83f04d13290023b8cc58f7581
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Napa battery charger nbc 90620 manual', indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=napa+battery+charger+nbc+90620+manual PDF link annotation
    • http://nososunovurosag.iblogger.org/99070745433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404738/normal_6000fa9261023.pdfIn PDF document text
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/7812106.pdfIn PDF document text
    • http://duwulavodawu.22web.org/40532751258.pdfIn PDF document text
    • http://nefisexisaw.iblogger.org/sebujuburonabileloxejases.pdfIn PDF document text
    • https://fufifodex.weebly.com/uploads/1/3/2/8/132814348/rireve.pdfIn PDF document text
    • http://timedezalug.iblogger.org/badlapur_songs_pagalworld_320kbps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481052/normal_602d48709a74b.pdfIn PDF document text
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/bazivudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5fe6d47ea13ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6a9378-4557-411a-9c83-92e0178ee14b/16608255649.pdfIn PDF document text
    • http://zazumevuf.epizy.com/physical_science_grade_10.pdfIn PDF document text
    • http://pojezevosolodo.rf.gd/fluke_77_multimeter_history.pdfIn PDF document text
    • http://namidonom.epizy.com/new_korean_action_movies.pdfIn PDF document text
    • http://tutalogivenerok.epizy.com/20634956575.pdfIn PDF document text
    • http://jemudizibumak.epizy.com/hypertherm_powermax_30_specifications.pdfIn PDF document text
    • http://bevelidokubisop.rf.gd/brain_disease_model_of_addiction.pdfIn PDF document text
    • http://jatowikuv.rf.gd/fulosoleguran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0203fc5b-7407-4cb9-a7e5-6ae9243f8545/sewugolajajazoxir.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 5964 bytes
SHA-256: d4b06adf92b4726fe5b8bc2911e143cfbe05a32903d0123c4c96493521f1cf31
font_01_sfnt_off00012d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D69 10980 bytes
SHA-256: 772a232e7bfc82321aa79eb7d47d131ccd422b5d31a801846f686cc110dc0f66
font_02_sfnt_off0001530e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530E 16076 bytes
SHA-256: 8ea7f1c1fa5cae84799308c3b5277d4d512d786787cd8f2796a1af00f3b64e48

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