Malicious PDF — malware analysis report

Static analysis result for SHA-256 230cb9fcdb4b0bdc…

MALICIOUS

PDF

76.8 KB Created: 2021-03-13 18:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a29443815e30226402a0154870faad14 SHA-1: d878988dfad2e7bb2c4456fa45043d641cbddd24 SHA-256: 230cb9fcdb4b0bdcd4b3fa7bf71ae6436e1edf4ab6b134b17135c846bc39aaa5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, appears to be related to search queries, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=what+does+hy+mean+in+a+text+message PDF link annotation
    • https://cdn.sqhk.co/gujowaxexag/uXBtidM/city_rider_scooter_review.pdfIn PDF document text
    • https://pesulomerusetus.weebly.com/uploads/1/3/4/1/134109359/8557594.pdfIn PDF document text
    • http://deruvakibifazo.iblogger.org/piluvuzagezimewolariluz.pdfIn PDF document text
    • https://kemigaguni.weebly.com/uploads/1/3/1/0/131070112/3985953.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/vuranumoji.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/1499386.pdfIn PDF document text
    • https://cdn.sqhk.co/migefareg/jiXzqOK/rixiwipojorawitupifoxek.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/6443a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/wonisizinurojerazarot.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/zinujavuli.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/clasificacion_de_cuentas_activo_pasivo_y_patrimonio_neto.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/who_god_says_i_am_bible_verses.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/mekipivimewusumezavokojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2ac93a-8bb6-49cb-a845-75a9c4d35c2a/material_de_lectoescritura_para_tercer_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d960e0a-0ac6-47d7-afb5-539a6c086721/motarawuzosukuwizegovagif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/641cab87-0fa3-4f93-bc42-562cc864c4cd/chapter_5_quiz_1_geometry_answers.pdfIn PDF document text
    • http://xesunuz.epizy.com/law_of_sines_ambiguous_case_kuta_software.pdfIn PDF document text
    • http://mekamaxabojumoz.epizy.com/pobokirelowapumexelives.pdfIn PDF document text
    • http://jilutuve.rf.gd/boss_rc_300_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fdad2d9-380a-4e3d-9cc6-ea0c72dc6779/best_skin_whitening_cream_without_any_side_effects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b40a07f-4ba7-46bc-bb63-4e640b5aa47b/briggs_and_stratton_725_190cc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed32e33b-2ce5-4b18-a6c9-17c50aa4f010/3703653784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52ec64b-0e80-41a7-a122-dffab9a371d6/50_shades_of_grey_soundtrack_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7378492-3752-4a85-bf28-546033593ca6/apple_iphone_5c_cases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f800d42-0a01-43fa-b00e-76e8b406edc6/make_a_list_of_at_least_10_most_commonly_misused_words_in_english.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_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 5296 bytes
SHA-256: a418e0582602675faa97212f4be4a226d2cabb0d60ad9add60fdffd8e0f4e19a
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 10288 bytes
SHA-256: 0b955dbcb790b7a4966114817467cce13b64a41af341a13ce673613daa949f48

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