Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7f2374dea4fd37…

MALICIOUS

PDF

79.5 KB Created: 2021-03-24 13:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9617e20215a67b7851a81654ff1baf75 SHA-1: 65aa4623ea4b48940164a831085c28357afee7cd SHA-256: 4a7f2374dea4fd37667aeb8ace31ddc7e5de1743dff6693f9549662d47d054b7
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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=student+of+the+astral+suit PDF link annotation
    • http://nakozek.mypressonline.com/analog_and_digital_communication_chitode.pdfIn PDF document text
    • http://tb-films.ru/zarurakidisomokedaxitovolzapu9.pdfIn PDF document text
    • http://kodepovorivapi.mygamesonline.org/badepidexafinizezisev.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/aqeedah_books.pdfIn PDF document text
    • https://damemebu.weebly.com/uploads/1/3/5/3/135316778/tolanilizesudebazeli.pdfIn PDF document text
    • http://qrettalq.online/observe_and_report_anna_faris_song0q99r.pdfIn PDF document text
    • http://greenbike.shop/kazojikogiwitibidceghj.pdfIn PDF document text
    • http://twirlini.com/kuletigr6s2.pdfIn PDF document text
    • http://copyrightshelpcenter.com/bawadisipufaraguwasele6foig.pdfIn PDF document text
    • https://nodaveto.weebly.com/uploads/1/3/4/2/134266094/8206db2d502.pdfIn PDF document text
    • https://pawudovavumub.weebly.com/uploads/1/3/1/4/131411600/pelesirukojow_mokepezewedevu_buguguku_madaf.pdfIn PDF document text
    • http://spiritstudio.ru/what_qualifies_as_gross_negligence87iy1.pdfIn PDF document text
    • https://nopivetof.weebly.com/uploads/1/3/4/5/134581756/3614914.pdfIn PDF document text
    • http://f13x.xyz/rising_of_the_shield_hero_light_novel_spoilersn77c8.pdfIn PDF document text
    • http://fullpisetc.ru/6077682240047t99.pdfIn PDF document text
    • http://prizinsta24.online/pulse_secure_ubuntu_client4alhy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/casein_present_in_different_samples_of_milk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897de446-d79d-4554-bd2e-2c64620ab6c3/89484004783.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_2da1a050c7e3491ab582b5ffb417ecd6.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_a9bf65c09d88419281ff3974defe3f2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edfb0267-3eb6-4ec6-932f-e6ec3944ab76/books_after_anna_todd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8ef6f7-5b40-49ba-ba9c-5d840f670e7c/95285890356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e6998b-ca26-4f24-9082-3c9b164b0b71/76418709291.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/semesewexemuv.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_2479aaec877b4bf8874925507d7500af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09ac2bb-b12a-4a21-a3bb-718da08579c5/is_there_a_sequel_to_the_fifth_wave.pdfIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_ddd1a04a488d40d8bebc930432c1d9f4.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_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 5096 bytes
SHA-256: 9823abded2781e11ade214ab19d660dc2b10dd9a2aa246860cd935dc3b6f8dbd
font_01_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 10692 bytes
SHA-256: c890db5ea0534591aa515321db637b2264c74cd5318d4feb7beaae8676c0eda0