Malicious PDF — malware analysis report

Static analysis result for SHA-256 761904a29d317881…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 09:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a19f15e16f339e6c860708c753210997 SHA-1: 8e81e786908ef0f84d6e891a18b9fe6e8ecabf3a SHA-256: 761904a29d317881d9f588e73d71149817eaaf940e038cebca82f22afe08a64d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, contains references to 'setcpu for root users apk cracked', suggesting a lure related to software cracking or potentially malicious applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/wix?keyword=setcpu+for+root+users+apk+cracked PDF link annotation
    • https://cdn.sqhk.co/jazumagefo/hjgfPHY/1_survival_escape_hints.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/hjcgcPJ/tornado_alley_bulldog_rescue_bcarn_ok.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/how_to_install_xfi_pods.pdfIn PDF document text
    • http://dinewegivogofe.mygamesonline.org/jedunaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_6011d9b60f62a.pdfIn PDF document text
    • http://dajexori.mypressonline.com/irregular_reflexive_verbs_spanish_preterite.pdfIn PDF document text
    • https://cdn.sqhk.co/neridisen/tNhgjhb/25304654758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_600c07a9b3dd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421767/normal_6000461554059.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/heghAil/pay_91_express_toll.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/1ieii9W/42119202489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fc59d8061fc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_60270dadab989.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/5abf3fd5-0520-420c-a8fd-14a2eb5fba02/english_literature_master_degree_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c320fc1e-729f-4150-8412-a5572e4736a0/koremoxefakigaxulokat.pdfIn PDF document text
    • http://zedowep.atwebpages.com/rezonuferikame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f35353-fe0d-43a6-bdd3-b517a61b7502/attack_on_titan_real_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7a1869-56d3-4b52-b30e-de0232a7d24b/trimble_business_center_system_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2f4b2b-6eb0-4149-86a3-f3b477042834/how_to_use_microsoft_access_database_engine_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c731b9-0269-4224-acea-b28677c419fc/limovilazikumuxawosam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741063de-20c3-43ef-a4b0-a91626cef704/xamajadosifejakikunav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4123f3aa-5827-4a63-9a3d-724078a2d119/xogopisawanewapasolomam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a188b8a9-d8fa-4508-85b9-cd2573ad37ab/the_leftovers_review_new_yorker.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_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 5284 bytes
SHA-256: c15894190e1686d354dc8b2cb87de14a59042f1b5abceb844ed5255bdd7351ea
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 10636 bytes
SHA-256: 7451b2d76e0e000835fc284e6c69708dc7f1c7c61b633568572faeeb267922c3