Malicious PDF — malware analysis report

Static analysis result for SHA-256 df887fc6fd4a2f45…

MALICIOUS

PDF

82.9 KB Created: 2021-05-12 00:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 99f34a6dfb31311a66670d52dea299b1 SHA-1: 9e26530e12aaeb30dc0cd0b13f0f8619393774a6 SHA-256: df887fc6fd4a2f451ea69957e41f694a20111eccdd02a43e05900d4c3014ccdc
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 0.9998

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://druttle.ru/strik?utm_term=what+are+the+3+types+of+arguments PDF link annotation
    • http://usesol.xyz/who_is_sammy_in_the_son_of_neptunev1ii6.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/idGx7mJ/horror_movie_suspense_sound_effects.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/jpiaiiF/rasudawuwev.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/24305757647.pdfIn PDF document text
    • https://cdn.sqhk.co/govonesed/LBcijNl/wepodawuredidixufisaz.pdfIn PDF document text
    • https://cdn.sqhk.co/duxisabaza/jikhgyw/cover_page_template_chicago_style.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/gi3QhhU/dilewakafepabedegaxomako.pdfIn PDF document text
    • http://milktree.store/4601138879ycbts.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/how_to_recognize_each_mbti_type.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/sap_business_one_accounting_module.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/abiiiie/sezigikelugezemim.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/26778055492.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinirumawe/cchaeij/baby_alive_doll_boy.pdfIn PDF document text
    • http://fomoregekamikat.mypressonline.com/gaketoxa.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/6c1f2dfa-d311-441a-8fa5-9610772cbff1/stoner_john_williams_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0775a050-4f7a-426a-8abd-f274c223e850/62929199825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0876becb-4ed6-4208-bd8d-1bef1389e3e9/18622701322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bbea87-6e8d-49c8-a99e-043a295b1179/wind_in_the_willows_movie_1996_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d86a1b6-1ad6-4c7a-a653-a711ff781873/judafosum.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_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 5564 bytes
SHA-256: b6b92d7f3dc02ade285dcdeabf91974af583413b8a8e4dc88e88f24f59861556
font_01_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 10960 bytes
SHA-256: b58bbe3abe44c692eac2808ec635400462d19c1a8eac4c51ef3429165741c129

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