Malicious PDF — malware analysis report

Static analysis result for SHA-256 506cf16e079562ef…

MALICIOUS

PDF

88.2 KB Created: 2021-05-06 17:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fb6693163ffbeeb982b75c8ba4a3db7e SHA-1: 9c406aa83f357d239e4628a3f2a7ebb81b6118cc SHA-256: 506cf16e079562ef591e9b1941e511b38d31219d3f74703ab02ee885df814842
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to form a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=minolta+srt+201+lenses PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452846/normal_6008b429ba7ec.pdfIn PDF document text
    • http://idealicaitalia.website/sql_server_portable_freeodg6h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473619/normal_5fe91f28318bb.pdfIn PDF document text
    • http://contact-git.top/how_many_miles_can_a_2006_honda_odyssey_last9j7q4.pdfIn PDF document text
    • http://vudasuti.mygamesonline.org/effects_of_youth_unemployment_in_kenya.pdfIn PDF document text
    • http://damvglaz1.xyz/dmv_written_test_questions_and_answers_2018qkgec.pdfIn PDF document text
    • http://kivolugog.mypressonline.com/visual_dictionary_french_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383445/normal_5fecc1004954d.pdfIn PDF document text
    • http://felagem.getenjoyment.net/gegowuferejopasinosi.pdfIn PDF document text
    • https://janusutaxukokaf.weebly.com/uploads/1/3/5/3/135347272/pexofasokuv.pdfIn PDF document text
    • http://sazinoz.mypressonline.com/why_sucrose_is_non_reducing_sugar.pdfIn PDF document text
    • http://instacopyrightcenter.com/how_to_get_started_writing_a_screenplayzr4sd.pdfIn PDF document text
    • http://counterman.ru/planejamento_estratgico_para_igreja902c7.pdfIn PDF document text
    • http://instapriz365.site/intermatic_pool_timer_motor_replacement4w6zu.pdfIn PDF document text
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/946a5b5.pdfIn PDF document text
    • https://xuzubakew.weebly.com/uploads/1/3/0/9/130969304/babiwap.pdfIn PDF document text
    • http://begetus11ppz.xyz/die_unendliche_geschichte_2_dvd_media_markt3wwiy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be43585f-19a4-45af-9aa3-457f4e6e1d62/zejoriwalijokawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e22d430-7ee3-4bbc-b6cb-94c6f131cc86/little_house_on_the_prairie_season_2_episode_11_cast.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001363d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1363D 18344 bytes
SHA-256: 0f71c56dad9f55681c227ca087a1349d8b19af0addf21e224f86b9f9413d7a7f
font_00_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 5008 bytes
SHA-256: 0fe66348a7dc5f42593668754f64e546a9a20244d14ad892992c0e90353adfc4
font_01_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 13260 bytes
SHA-256: e81afc44e0cbb8e7e62709edb4db8c85d45b1727b11d013b62433ef23ffad47a

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