Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54ad9b0461c24e8…

MALICIOUS

PDF

70.5 KB Created: 2021-02-01 03:21:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2c4eae7f3354cfd3a0c7f64a89203ab SHA-1: 943ce11809970b277787fc5b787654f5f02898b0 SHA-256: a54ad9b0461c24e802581f15f3fe236b8e0e21556fa2c3725b702c48180c0ca9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and using UTM parameters, strongly suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=cargador+solar+casero+pdf PDF link annotation
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/8c3f40a290d.pdfIn PDF document text
    • http://sajutasure.22web.org/remujakok.pdfIn PDF document text
    • http://easylearning.space/934823027603oo8u.pdfIn PDF document text
    • http://ourfanz.com/reinforcement_and_study_guide_biologmlil2.pdfIn PDF document text
    • http://cashbackmoney.info/89119838404xemkg.pdfIn PDF document text
    • http://boxberry-24.cc/traincontroller_9_gold_serialcdlz2.pdfIn PDF document text
    • http://badge-verification-center.com/92486632347l8uct.pdfIn PDF document text
    • https://xilarurizajefa.weebly.com/uploads/1/3/5/3/135347329/tavenorur.pdfIn PDF document text
    • http://detonicinitalia.website/sociology_class_11_chapter_1_notes_in_hindigva4j.pdfIn PDF document text
    • http://fitness-ital.fun/bad_boy_mp3_download3jnlh.pdfIn PDF document text
    • https://zonujonuwug.weebly.com/uploads/1/3/4/3/134309714/doguwix-pigemabemu.pdfIn PDF document text
    • https://nasoxatexiwek.weebly.com/uploads/1/3/0/7/130739087/e5817289.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/mawesenasijoser/58160138814.pdfIn PDF document text
    • http://kosirokuki.epizy.com/mukefesejafab.pdfIn PDF document text
    • http://lobakixadob.epizy.com/alodinia_definicion.pdfIn PDF document text
    • http://benepiro.rf.gd/active_listening_strategies.pdfIn PDF document text
    • http://dodudulu.epizy.com/second_language_english_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/jejumazoditegirevi.pdfIn PDF document text
    • http://midotujeg.rf.gd/adblock_free_windows_10.pdfIn PDF document text
    • http://suzebotazolonav.epizy.com/wrong_turn_7_movie_720p.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_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 5228 bytes
SHA-256: bbfe1cfdebb0dec726a92f564891fb1e9a680cb31e2e0c95dd24b1ff487252a0
font_01_sfnt_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 10204 bytes
SHA-256: d73b14eff0ef6f6f816e3605bcb770848a9c2ec4f02f90a89c4c7934d385b094

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