Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8b8c51a37c43e7…

MALICIOUS

PDF

76.7 KB Created: 2021-03-09 02:26:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2371412707c7f9a14cc4bae5922ad88b SHA-1: d5b8db7422a3d5e0de1d37b8d6b81047c4f66641 SHA-256: 5e8b8c51a37c43e7b53bfd87fe250056ea9b6617081e9920eb8172cde67389ff
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDF files hosted on disposable domains, a common tactic for SEO manipulation or distributing malicious content. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this behavior. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

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://leonvi.ru/award?keyword=information+of+carbon+compounds+in+everyday+use+pdf PDF link annotation
    • http://gajaxujifusokul.mygamesonline.org/rinnai_r75ls_maintenance.pdfIn PDF document text
    • https://pupogonixim.weebly.com/uploads/1/3/4/3/134318621/1470912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_60336fa2405a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_5fe93b2d2960f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_5fe75e795e9fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_603ef04cf3148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_6017c44c0448f.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/thermaltake_core_v21_window_side_panel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481540/normal_5feb5bb777b2a.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/210693119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385631/normal_5fcea8104b50f.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/cat_in_the_hat_babysitter_scene.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/wafelura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_600aa29133184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_603074e750c6d.pdfIn PDF document text
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/xiravaludozi-jawidepamavir.pdfIn PDF document text
    • https://lipojiwogim.weebly.com/uploads/1/3/0/7/130776075/pobubuniporid.pdfIn PDF document text
    • http://fuvisetitisenon.mypressonline.com/15322894812.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/love_story_movie_telugu_teaser.pdfIn PDF document text
    • https://pipefedib.weebly.com/uploads/1/3/1/3/131383483/5125251.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/f993817a-9db2-4ac8-85a3-79e410bef95f/national_competency_based_teacher_standards_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3da4d8c-e6b8-46da-8ab2-31ccea31c07c/murajowupaxuseguvekogat.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/how_much_does_fallout_4_dlc_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c38a90bc-1352-4b44-9889-b1e93a896d80/what_is_the_difference_between_soft_news_and_hard_news.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b252297-0bc4-4d5d-9855-66212c883fc2/66523401721.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_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 5508 bytes
SHA-256: 96bb5679ed384c7ffea8de148ba159fa05203a2541fa129fa515c0a0f751eb38
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 10624 bytes
SHA-256: 6017a9eab936d9813e438769a037fff2566b36a35150d0bd6221ab7f46946c17

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