Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b2ce9405122c4e…

MALICIOUS

PDF

75.0 KB Created: 2021-03-15 08:18:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 436b3fc11c1a1e2613e693a34704acf0 SHA-1: eda301ca57292e6cb2420dfb09f2844b7fb07e88 SHA-256: 55b2ce9405122c4e8d2901e81f1ebd944eb7e2b74011d7f2a721cb140e311dfe
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with one prominent URL leading to a link farm designed to host multiple PDF files, likely for obfuscation or to spread the malicious content. The document body, though heavily obfuscated, contains text related to a 'social club app pc', suggesting a lure for users to download a fake application.

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://xajibur.ru/123?utm_term=social+club+app++pc PDF link annotation
    • https://cdn.sqhk.co/pometobab/jfHgyTR/rustic_night_table.pdfIn PDF document text
    • http://merogerofame.66ghz.com/61005128762.pdfIn PDF document text
    • http://eslivdrug.space/trinomio_cuadrado_perfecto_ejercicios_resueltoszeg4a.pdfIn PDF document text
    • https://cdn.sqhk.co/nobegasosev/BIjcsF5/48830081045.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/hrofifa/poutine_definition_etymology.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/juaPgh2/vezijusinu.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/icjjmib/calculer_un_pourcentage_solde_formule.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/ahchap4/56590914096.pdfIn PDF document text
    • http://connexion-amelii.xyz/kwikset_909_battery_change39ce6.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/Qts6Nha/64645719129.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/iegjjjV/22515244101.pdfIn PDF document text
    • http://servisvds.ru/18888791430c0r36.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/MicghqA/dead_bunker_2_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/dU8jiOg/vasonukeniziremosefewona.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/gibKejd/newegg_coupon_codes.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/sefiwegegagu/jamubevuxezit.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/facebook_apk_dark_mode_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/juwegumem.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/begum_begum_ringtone.pdfIn PDF document text
    • http://zatutokoluk.epizy.com/70445253436.pdfIn PDF document text
    • http://tuxexagixib.rf.gd/adam_smith_theory_of_moral_sentiments.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_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 4896 bytes
SHA-256: 2d841a0ed23d434deea4b8693770f7e92f5efd2947e344a0e2979643f7141886
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 12040 bytes
SHA-256: 20126b4391594e9409bf8691f480ce57611ce4953b940cfcd6beed1d0c5966d6

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