Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b7a309810e7ed3…

MALICIOUS

PDF

97.2 KB Created: 2021-03-15 13:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 497e1b64c59294b85226b0f420d1ec46 SHA-1: cedbb05228dc94c4a1a75eaab032651fa05c186c SHA-256: 50b7a309810e7ed396ddb36e47ca450b257e040111ea303085ce43e7a5a82658
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lozipotod.ru/strik?utm_term=star+trek+discovery+season+2+dvd+walmart PDF link annotation
    • https://cdn.sqhk.co/fomavulobet/ALlicGL/amman_tamil_movie_hd_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_604ee5794bdc0.pdfIn PDF document text
    • http://rubeatyshop.xyz/download_film_the_raid_2_360p1eipm.pdfIn PDF document text
    • http://raifaisentapp.online/lsbf_acca_f2_notes_free27cxs.pdfIn PDF document text
    • http://reawolt.online/46131792497vyt82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_6046277b36780.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/q6gghjb/formula_1_qualifying_rules_history.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/hcYhiif/diamond_sharpening_steel_for_knives.pdfIn PDF document text
    • https://cdn.sqhk.co/lenubire/fthgHib/32542057536.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/bGhbkIf/pumujidunumawada.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/euZqiin/glory_road_movie_trailer.pdfIn PDF document text
    • http://artyom.guru/barcode_generator_software_free_mac1e1i2.pdfIn PDF document text
    • http://testersairf.xyz/gaxasaxav5j7w.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/c42E8bs/super_penguin_league_3_vietsub_ep_2.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/jjgh1gi/top_songs_2020_list_in_uganda.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/cjhjin0/zutufajiferaxiwek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457862/normal_5ffcefc17861a.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/hjb4Zih/civilopedia_vi_espanol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_62a140be75134f9781dde9f197524bd4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/bounce_dryer_sheet_uses.pdfIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_3dfc261c2f9a4307bc021f1982569062.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_029d3204b5b648fea5866c01ae8ea940.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_ff3a3789507c44a9a1a08c389fa19a83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lazolu/mijiviromowasi.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_off00013ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA6 5640 bytes
SHA-256: 859a6d47ba558dc8b534d9d466fc3b4bcd37c2b13f99b6b5a072ec6e6f6d5749
font_01_sfnt_off00014fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE3 11856 bytes
SHA-256: 31400c0e41f4a0dcb770c2916665551567e781d605ef4ec0dfe1491fc0b88908