Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcad1ff35b5995f3…

MALICIOUS

PDF

85.3 KB Created: 2021-03-16 00:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ac5dec26196a4a359435bfeb8c7a2f44 SHA-1: 86745b539223d1509f33e1c7d7fc4c6eded06bbb SHA-256: dcad1ff35b5995f3fea2b617100ad05bf4ac1d91e7aaa603e43cb2ef06a70d77
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is identified as a link farm, with one specific URL pointing to a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains references to downloading an APK, suggesting a lure for mobile malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://zajinet.ru/wix?keyword=download+apk+uc+browser+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449984/normal_603d025617628.pdfIn PDF document text
    • http://gixitetopes.scienceontheweb.net/38449845303.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455396/normal_5ff07c2acec10.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/xufarotalanuduxojuz.pdfIn PDF document text
    • http://mebotus.mypressonline.com/begupogabex.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/90378342026.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/funisamit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_601f930c5693d.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/97673242845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470526/normal_5fe2197eca81d.pdfIn PDF document text
    • http://fesaniru.iblogger.org/software_testing_course_fees_in_hyderabad.pdfIn PDF document text
    • https://moforikegumiret.weebly.com/uploads/1/3/2/6/132680993/tunepejadenaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5ff5eb9fef9d1.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/muvipimorulu.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/dell_optiplex_9010_cpu_i7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_61ea60e53442401691d1bab5e5edbe37.pdf?index=trueIn PDF document text
    • http://keruxenuriwi.epizy.com/counting_to_120_worksheets_for_first_grade.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/lofidagafaw.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/how_to_play_the_game_of_life_junior.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_94ccbaec25f945648639fdd9c084511a.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_5c8e922c85e7473ab17c40ffb14939b1.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_917d9f1953f64dd3b6bc2cfc4a91592f.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
    • 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_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 5512 bytes
SHA-256: 626220858b3b1cd551357e9a6c40380e034b3cf1e38f470754183e82741220e0
font_01_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 10988 bytes
SHA-256: 1d8678c4b33d2389ddd5669a8ba444f4fee85fe3323d942eeedbfc9886edfcd9
font_02_sfnt_off0001311f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311F 16452 bytes
SHA-256: 39a2c97ce8f74641e17f460d02fbedfb9115e9e8571d134b06e73a3c5105a752