Malicious PDF — malware analysis report

Static analysis result for SHA-256 138bc68e8a740218…

MALICIOUS

PDF

74.7 KB Created: 2021-04-15 20:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8b8806c921be44a2429ccbf06847e64f SHA-1: 2cd39018ac467ec0a0db833bd2ec3a39573bb284 SHA-256: 138bc68e8a74021824eb7c1917602ff2253a3648960fb04cee125a7b5f6f712b
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a prominent one pointing to 'https://nipisod.ru/strik?utm_term=sample+research+paper+using+apa+format+6th+edition', suggesting a phishing or malware distribution lure. The document body, though heavily corrupted, hints at a research paper theme, reinforcing the lure. No scripts were extracted, but the presence of external links and the ML detection strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/strik?utm_term=sample+research+paper+using+apa+format+6th+edition PDF link annotation
    • http://3203epworthcres.com/30570975411k7co8.pdfIn PDF document text
    • http://retamos.mygamesonline.org/14734331569.pdfIn PDF document text
    • https://loxoratas.weebly.com/uploads/1/3/4/5/134507201/neler_vemonanalubigod_xumosafariko.pdfIn PDF document text
    • http://foyou.store/kubovobij2t0fk.pdfIn PDF document text
    • http://energierecrute-emplois.com/enojada_pierde_piggy_gifsio17j.pdfIn PDF document text
    • https://pogerukafitili.weebly.com/uploads/1/3/1/4/131437037/jupamigi-nuvusafawiko-fivarodeko.pdfIn PDF document text
    • https://bojowavezuzabi.weebly.com/uploads/1/3/1/3/131382797/rofedumuxapedojelag.pdfIn PDF document text
    • http://midesamipazizuj.scienceontheweb.net/30446333081.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/diablo_bestiary_the_book_of_adria.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/45316729819.pdfIn PDF document text
    • http://help-igcopyright.xyz/tinixagesonagz1p74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawokale.myartsonline.com/telix.pdfIn PDF document text
    • http://jabepekepino.epizy.com/food_flyer_template_microsoft_word.pdfIn PDF document text
    • http://donufuruwitij.atwebpages.com/gluten_free_meal_plan_for_weight_loss.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_ff86804747cf4d95aabf53725cf939d5.pdf?index=trueIn PDF document text
    • http://ravojovi.epizy.com/darbhanga_weather_report_current.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_f44ad8d8d11c4b07a984cf671f5db893.pdf?index=trueIn PDF document text
    • http://desujiruvomeb.myartsonline.com/algorithmen_und_datenstrukturen_download.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_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 5828 bytes
SHA-256: 38eae5b6b68e7e805d90d7841bdcbe65efa68bb1419e230876f0b840977e55ee
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 10524 bytes
SHA-256: 7e7bf3b6753255fb194e9e09f223167d9b90ff64f613f7947284b1c3c2857cc9

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