Malicious PDF — malware analysis report

Static analysis result for SHA-256 42547c9f373a07b9…

MALICIOUS

PDF

90.6 KB Created: 2021-03-04 13:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1205546262bfbe2897f57ab5c242a1af SHA-1: 785fe48c2cb4d7c6971bc4432f65905298dcca87 SHA-256: 42547c9f373a07b91ea84d18b9a53d5c47dadd2aaee7250ce4c6702fc368eda0
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a prominent one pointing to `https://golowaki.ru/strik?utm_term=the+pit+and+the+pendulum+quotes+quizlet`, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=the+pit+and+the+pendulum+quotes+quizlet PDF link annotation
    • http://oneplusonemain.xyz/what_to_get_my_boss_for_her_40th_birthdaysy107.pdfIn PDF document text
    • http://vvinorama.fun/91102647453nk967.pdfIn PDF document text
    • http://onlinetiser.website/zudawikowijomejolabir7sayj.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/KidsxBx/mexidirepasogebopasosug.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/Wgiwihb/free_old_school_ringtones_for_android_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/lvspiaH/35751984007.pdfIn PDF document text
    • http://kokilubowo.22web.org/how_much_does_a_private_investigator_cost_in_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/gfzGgdJ/cruise_ship_driving_racer_video.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/bNBhgja/codigo_procesal_penal_de_guatemala_actualizado_2017.pdfIn PDF document text
    • http://euromarket.pro/63389290401gvx17.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/b92b7388-f85c-4692-aef7-e3799f81ac79/gelak.pdfIn PDF document text
    • http://refowinevog.rf.gd/31408730456.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/1061296069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b282d2-c4c0-4077-9767-61e4b4f560be/bibatuzofufep.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/why_wont_my_fitbit_charger_work.pdfIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_3190c20a8e9748a6a8debfe5f64cca87.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_7873d8447490402aba8878f8befeebfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/859c2c84-0bf7-494d-8899-ddfb4cacf003/70882355838.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_aaee5d7713524f7c95346013f1c2d5d8.pdf?index=trueIn PDF document text
    • http://bajipogijos.epizy.com/simple_interest_worksheet_iprt.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_3d706d78cf99490d8886eca10679614a.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_e1750e79b4da4d64a67ccb42bb4efa9b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 5228 bytes
SHA-256: b5238e761f3d2475a9b327b958b413deb0fa42a828202153b401086afb8ecc4d
font_01_sfnt_off000136f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 11348 bytes
SHA-256: 4becc144e41903ce094dcea4731efa7ef9fb860969826c25fa73f2d60b9f6b07

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