Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b388ef55d8f8fda…

MALICIOUS

PDF

89.0 KB Created: 2021-04-06 03:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a2a1d49c6daab2bdb3a1c08c2a37ad10 SHA-1: b83a6fb522c24497b1ad274c62332ce88d389216 SHA-256: 7b388ef55d8f8fda1939e6183a98de19359d5712b202435c2742ae308d01602c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to a website that appears to be a link farm for SEO purposes. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=bridesmaid+duties+checklist+pdf PDF link annotation
    • http://sotipidikukunow.getenjoyment.net/22129282557.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/how_many_cubic_feet_is_an_apartment_size_fridge.pdfIn PDF document text
    • https://sowikidorazeku.weebly.com/uploads/1/3/5/3/135306740/segujesogo-rafagodiza.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/ee045b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tezofuretejom/winkawaks_emulator_for_pc_free.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_3baa27461331417ba368d38c52cc899a.pdf?index=trueIn PDF document text
    • http://musizaxodolof.epizy.com/rupepijolewobonewino.pdfIn PDF document text
    • http://tofirutu.rf.gd/buchungsstze_beispiele.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_72f1607de89c41d993217e97925df86b.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_8632ada71a2f4e978c8fef816f7712f6.pdf?index=trueIn PDF document text
    • http://faleferesevo.onlinewebshop.net/program_spectrum_remote_ur5u-8780l-twc_to_cable_box.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/significant_figures_chemistry_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/dominant_and_recessive_traits_worksheet_5th_grade.pdfIn PDF document text
    • http://gagonunanu.epizy.com/babemalujetowaf.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/good_cheap_android_phones_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/nizufolojozegomupaguzef.pdfIn PDF document text
    • https://2c0370cf-43ec-4dc9-8589-ec1e7793a70d.filesusr.com/ugd/404058_34e37ee4790143c09f9a8e2623e81b89.pdf?index=trueIn PDF document text
    • http://jifagul.rf.gd/zaxiridezilit.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_a84154c1a79c4131ac997ecd790ccf07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinadi/java_programming_software_for_windows_10.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
font_00_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 5176 bytes
SHA-256: 303f2331aff4d311d20977470557d40470cf314b4d167a38fdb583c59afde337
font_01_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 11072 bytes
SHA-256: cec459cafcb919bda20e68b53fbc8008c19bf2f5e476790eeb2cf0695b1795a1
font_02_sfnt_off00014870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14870 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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