Malicious PDF — malware analysis report

Static analysis result for SHA-256 528e86a1675ec180…

MALICIOUS

PDF

75.9 KB Created: 2021-06-03 08:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5b5be5c8c668d9b17c1ea4182375eef9 SHA-1: 3e8fd64adad6b4c356b7d29389d99a9a8b87739c SHA-256: 528e86a1675ec1803b4b55b57a1444f18ab92c9c816c52a07e8f7ff45db419f8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or distributing further malware. The primary URL, https://smidgel.ru/pbw?utm_term=xanathar%2527s+guide+to+everything+download, is presented as a download for a popular game guide, a common lure for social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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://smidgel.ru/pbw?utm_term=xanathar%2527s+guide+to+everything+download PDF link annotation
    • https://wakazezoloke.weebly.com/uploads/1/3/3/9/133999839/lefavud_dosul_fupenodeziv.pdfIn PDF document text
    • https://purelukanixavaj.weebly.com/uploads/1/3/1/4/131454065/3711084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_603848b321b1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409610/normal_6002495638f45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5feb443daac29.pdfIn PDF document text
    • https://tejifogigevavep.weebly.com/uploads/1/3/4/6/134675995/e722dc6d781ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_60368a6fa0400.pdfIn PDF document text
    • https://wupovejiti.weebly.com/uploads/1/3/2/8/132814541/4082927.pdfIn PDF document text
    • https://jitoxazenop.weebly.com/uploads/1/3/4/5/134588357/3a98f2a4e96.pdfIn PDF document text
    • https://lodunuvivilaz.weebly.com/uploads/1/3/0/7/130775731/sigiladoduse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_600c377fcbef0.pdfIn PDF document text
    • https://foxuginatumusex.weebly.com/uploads/1/3/0/7/130775376/1428031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384154/normal_5fe0e308756a7.pdfIn PDF document text
    • https://zamokofoviwikaz.weebly.com/uploads/1/3/0/8/130815095/pefesek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475853/normal_6009953abd9bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_60698f8ce2a44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gopidam.pbworks.com/f/46625360165.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/w/file/fetch/144514056/does_kaiser_have_a_24_hour_urgent_care.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2972c495-71b4-4742-a685-24fd35a7f879/what_are_the_rules_of_the_mormon_religion.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/144499791/factoring_simple_trinomials_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb013e7-be85-45ef-a777-7a16eb16257d/can_ipod_nano_7th_gen_get_apple_music.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/como_poner_trucos_en_gta_san_andreas_para_android.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/how_to_calculate_sample_size_for_a_retrospective_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35b765a-1862-48aa-a919-2f493323d1be/el_alquimista_libro_completo_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b00b58c-ecd6-4db0-b861-7d455c719290/zidulafarodijibopivigizob.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_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 5352 bytes
SHA-256: ded007b7c41f9df545e61d41714148111966a95a40c137e7c59095b9eb2d8d9c
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 10584 bytes
SHA-256: 4956522eac90d2e10c8718d74d05172e84265daef04df8b9939d0bbbff47a2c3

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