Malicious PDF — malware analysis report

Static analysis result for SHA-256 9869b55e23937c64…

MALICIOUS

PDF

87.1 KB Created: 2021-03-23 19:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d8557bc1299a01977484309bce25506f SHA-1: 45b6bed19b81ebee1e2170597ab06a88654b2734 SHA-256: 9869b55e23937c6409cf2cf9f8bc0c358ba2736a1b89163b2d92021f8fb729c7
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports the phishing lure, aiming to trick users into downloading a payload disguised as router setup instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=asus+ac68u+router+setup PDF link annotation
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/7c3b3f2.pdfIn PDF document text
    • http://masajsalonunuz.com/540630307858wqu9.pdfIn PDF document text
    • http://parrrtner.xyz/70880611318qka6h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_601b1aa02059a.pdfIn PDF document text
    • http://getodupelipod.iblogger.org/how_do_you_make_a_baby_toga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_602e3b5aeb973.pdfIn PDF document text
    • http://vehicleinsusa.com/95891719686cvb5g.pdfIn PDF document text
    • https://cdn.sqhk.co/vawikepaf/ggmibgc/59401530063.pdfIn PDF document text
    • http://rutenowataba.iblogger.org/buzoxikosini.pdfIn PDF document text
    • https://fadexawotizetav.weebly.com/uploads/1/3/4/3/134339615/zevurapubemasidix.pdfIn PDF document text
    • https://genexezo.weebly.com/uploads/1/3/4/6/134616565/rujiwasoworexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_60562efebd783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_6033300729698.pdfIn PDF document text
    • https://cdn.sqhk.co/rokijatu/heidgfm/gubusiroxasakixopoponop.pdfIn PDF document text
    • http://allostar.buzz/does_maytag_top_load_washer_have_a_filternfxtl.pdfIn PDF document text
    • http://toppiksnack.xyz/harry_potter_cast_hagrid_real_namel8m15.pdfIn PDF document text
    • https://cdn.sqhk.co/taxotuzu/gdiiiaM/cannonball_run_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/hbiga5p/papimo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426271/normal_5ff63522204ab.pdfIn PDF document text
    • https://vepidatebodosa.weebly.com/uploads/1/3/0/8/130874400/9207749.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/3d1b1ab3-d370-43a7-af28-02f5aaaa204d/miwopamofoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68910f22-d452-4a1b-b3de-d7fd2e00de08/52242276937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a274b62-0a8a-4c2f-9cbe-50754b1fdc68/48516331583.pdfIn PDF document text
    • http://maxezexisog.rf.gd/how_does_illinois_tax_retirement_income.pdfIn PDF document text
    • http://gupufodoluvasa.rf.gd/valkyrie_profile_lenneth_android_obb.pdfIn PDF document text
    • http://lesodabat.epizy.com/safositumaz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 5232 bytes
SHA-256: 48585ee1028f45ddcdde94f80ed03aca91212d2ec6627eff40e161b5b480847a
font_01_sfnt_off000126ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 11728 bytes
SHA-256: 45cb49a7c67130c954bdcf05b7dfb4238d9e0fa90f3e352ac3d787a0b5bb470e