Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1473b3d0b466e56…

MALICIOUS

PDF

76.0 KB Created: 2021-05-10 21:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 23006262794abb1dc59d2904e9bed165 SHA-1: 27430f86ce0c489e335c3ab0849a4e39dbaf0f47 SHA-256: a1473b3d0b466e56afe8a7865ab1f682350e5ae569393119cb72ac3711916cac
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to 'jacksth.ru' and appearing to be a redirector. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or a downloader. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=lord+of+flies+summary+chapter+4 PDF link annotation
    • http://5dradio.ru/pavaxufahbgcm.pdfIn PDF document text
    • http://detonic-romania.website/24549162393m0vi1.pdfIn PDF document text
    • https://zonujonuwug.weebly.com/uploads/1/3/4/3/134309714/kabapateled_jozasajeledilov_nawusalanaj.pdfIn PDF document text
    • http://noroxutapokuz.iblogger.org/acetazolamide_davis.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/wedekixo.pdfIn PDF document text
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/forivod_rixej_tusukusafakijot_pubiz.pdfIn PDF document text
    • http://adminhalil.com/5592621302zhnps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimixof.onlinewebshop.net/59844696866.pdfIn PDF document text
    • http://bikenuzuxidan.epizy.com/23912217976.pdfIn PDF document text
    • http://tokejavopif.rf.gd/difference_between_hardware_and_software.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/16396100598.pdfIn PDF document text
    • http://zorenepovapaj.epizy.com/6681152553.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/android_autocompletetextview_example.pdfIn PDF document text
    • http://wuzuwoxijotefik.epizy.com/correlative_conjunctions_exercises_multiple_choice.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/hair_the_musical_characters_list.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_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 5528 bytes
SHA-256: 76e85c546a8273e6390413cdddcaf10280e4ad7ce952c0a9357695c08a276254
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 10952 bytes
SHA-256: 877218fbce1cd420d7391a2a69d1183a789b86391df807a1a754cbcb0a14b0ca

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