Malicious PDF — malware analysis report

Static analysis result for SHA-256 117e71dd52f80dbc…

MALICIOUS

PDF

81.0 KB Created: 2021-04-02 23:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c373f9ae2bddab6ecc80d2cd907a3ba8 SHA-1: c6ad40887f47b819e382196a13b421b1e83604e0 SHA-256: 117e71dd52f80dbc890221ab664c0c755faffff54c491bf557b8ae08dcaba04c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the document's structure point towards an attempt to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

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://bologen.ru/strik?utm_term=artificial+neural+network+definition+pdf PDF link annotation
    • https://cdn.sqhk.co/vekosozob/mEEVHow/95211907149.pdfIn PDF document text
    • http://pidopefajo.22web.org/newspaper_layout_template.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/jeXSjPH/liradafi.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/njgjex8/jidokoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/gdO6jhr/cat_evolution_clicker_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/Bhdjjij/6871149516.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/26xqjeR/93077150939.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/LjhQhaI/word_cross_out_line.pdfIn PDF document text
    • https://cdn.sqhk.co/wemulekojex/wsNZgem/xalemelusagesutijinupipog.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
    • http://xebowuruno.epizy.com/libro_gramatica_espaola_larousse.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/45161322360.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_4dfc92ab76bf42acbf80083adc3f2b7a.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_3d5c054f566c49feb2c38430efd3fafa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/50208277523.pdfIn PDF document text
    • http://waxeduvipi.epizy.com/how_to_work_an_amazon_echo_dot.pdfIn PDF document text
    • http://gaxufaxurawago.epizy.com/22859298870.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/free_printable_special_education_lesson_plan_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/nasa_challenger_disaster_report.pdfIn PDF document text
    • http://rukevoseworo.rf.gd/54928491157.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/how_to_stop_using_run_on_sentences.pdfIn PDF document text
    • http://vadatomas.rf.gd/teacher_job_cover_letter.pdfIn PDF document text
    • http://pebimomedunuzux.epizy.com/husqvarna_128ld_parts_canada.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_178b6a94f21941aeb0bae4e95b1d577b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 5000 bytes
SHA-256: e0cf5324d23cd176a25561db187265ede14e520afe53acfa84090fe9c9e2ae48
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 10956 bytes
SHA-256: e0612461ef7236650e6aa093aab80e7eac52d970f81c7ee0a6cde7c7c7ac2554
font_02_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176