Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d103f8dd3947b66…

MALICIOUS

PDF

87.0 KB Created: 2021-03-13 22:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d7da274f22a3f6e9ae25bc99b027ba4 SHA-1: a9720927ff5e4893054df5bbc0f0c9a515e63c3e SHA-256: 4d103f8dd3947b664172e9f07ab57338a5f8efeb1b2be03f68774748a10f1948
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/wix?keyword=evergreen+public+schools+classlink PDF link annotation
    • http://beautysss.site/605275862065xu9u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_600f2ee61bdcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402706/normal_5fcb2644a45d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_6044ae7e0f4e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470218/normal_5fdd94ce2f449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406787/normal_5ffd283974a19.pdfIn PDF document text
    • http://esclub.info/im_only_one_call_away_karaoket3n52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_5fdbe0cd68a31.pdfIn PDF document text
    • http://sberin.xyz/moon_river_chords_for_pianog9trm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452599/normal_5fdcf8f539ea5.pdfIn PDF document text
    • http://shopeuro.pro/omron_blood_pressure_monitor_hem-711dlx_manualpqiwg.pdfIn PDF document text
    • http://itdiscounts.info/zekoxepimodivoliladonemiupiyl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_604132e1d1feb.pdfIn PDF document text
    • http://hookup673.site/ham_oven_roastpse9n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_600a2990ba6bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvufajozurez.rf.gd/answers_bible_curriculum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b80a552-29ab-4986-a554-113f821d65c5/88981581009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be45d768-e392-462b-8c10-e3598337d06e/warhammer_40k_5th_edition_space_marine_codex.pdfIn PDF document text
    • http://nidolivudazos.rf.gd/vista_128bp_programming_guide.pdfIn PDF document text
    • http://pamiwumewamem.epizy.com/pompeii_imdb_parents_guide.pdfIn PDF document text
    • http://gorevifero.epizy.com/85513345509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983adb6b-4161-4b1c-aa17-f1ce88546833/gebukorinipewuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0adcb5e-4441-480e-abfa-c9a6e1795940/55364872814.pdfIn PDF document text
    • http://zixugikel.rf.gd/microsoft_project_free_download_32_bit_trial.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 5416 bytes
SHA-256: 343c7979bc215bbb4c14a85ea883ff7121bd756e7a395b8efd6b941a55d35702
font_01_sfnt_off00012830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12830 11388 bytes
SHA-256: 46893e0e1c6b8dbd87e1ee6211850afaa028d5bb78469a985895a7c35c1bbed2

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