Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca71631ca552bb84…

MALICIOUS

PDF

155.4 KB Created: 2021-04-21 16:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c936614c6cdf599236b75aa1ecd0328c SHA-1: 7df5994d783895dd0b24fe143d7b131fa0ac8ec0 SHA-256: ca71631ca552bb847e92239ed062afd09621e8a98c768086e3f74b14716f4490
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to potentially malicious domains, disguised as search results for popular media. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fokemale.ru/strik?utm_term=sword+art+online+alicization+war+of+underworld+dub+release+date+crunchyroll PDF link annotation
    • http://kadanijojabuf.mywebcommunity.org/sitaraga.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/jjTShuc/45053222684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_60665bc0bfba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409239/normal_600540afe4bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_6053bb06f39aa.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/gjhjb7T/earn_recharge_by_quiz.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/FX3gdR4/currency_conversion_calculator_cheat_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/hA625b2/77811924750.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_21b69dbba1154ed399e784fca2ed997f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f981bf-3aa1-4e86-9090-8a3ff19e1512/head_first_python_2nd_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d3ac81-d833-469c-877d-a6e5e2b94684/what_is_a_plural_possessive_noun_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f686f9c-3598-4424-9e04-eec1a98919ae/craftsman_109_lathe_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50853711-669f-411a-9e3e-d0f5ae1b693d/avengers_endgame_script_copy_and_paste.pdfIn PDF document text
    • http://jujobope.atwebpages.com/grieving_the_loss_of_a_child.pdfIn PDF document text
    • http://dufobirufo.atwebpages.com/atmel_studio_7_c.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_2ae525c4895940d5b8c49004c7957938.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e8b5fd-c760-4774-867e-80270ae1ea87/95250966767.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/kelojadasedabezana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d33a08e-3e05-4521-b314-2d25cf6cbe4a/37827440090.pdfIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_6ecb86f2f8d24d4d9ba142acdd9b2c35.pdf?index=trueIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_77e5c32e069249f78b2134755ed0a2a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77dd9c8-00be-428a-962b-510bd4d40529/tuvamezuvefawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bfcdcc-e30f-4701-86ee-0562da95ecc9/god_who_strengthens_me_verse.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000145e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x145E0 74140 bytes
SHA-256: 39b2ff16d82c3c37b3cef2eaa2e7ef86bb00978f23054c794ddbaa3ce3dd4829
font_01_sfnt_off00022426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22426 5596 bytes
SHA-256: 0da2a0c2a7e3576ad7219c7278fa471ad396199992391404abce716b54575608
font_02_sfnt_off0002374b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2374B 12144 bytes
SHA-256: 6cf711ddefab289cedcb649823d3449329074634123706a4eb1e7ad75803515e