Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d31d1f1dd43f259…

MALICIOUS

PDF

78.5 KB Created: 2021-04-06 00:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99c034f601175a1e60d2a2ec964f9f6e SHA-1: c88bba5b9413861762e65680da26e42b291cbe07 SHA-256: 8d31d1f1dd43f259d5d664bd9522c1fc43c9bd4300ff06ae98cd9fc9aae6278c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to other PDFs hosted on various domains, many of which appear to be disposable. This behavior is characteristic of SEO link farms or distribution points for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/strik?utm_term=harry+potter+book+1+title PDF link annotation
    • https://besukobar.weebly.com/uploads/1/3/1/0/131069863/duvuwarugufej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_604b1799d4e75.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumila/9rjgE7o/ch_play_apk_cho_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/rp7hehg/xesutikuwokomikoweni.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/icA7RYD/hotword_changer_for_assistant_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/libodinidep/XFjLdje/word_search_creator_abcya.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/iMWhbx9/honey_bees_information_video.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/gw1Qdij/43840235447.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/cjagfC7/55686513878.pdfIn PDF document text
    • https://sotipazokelaxat.weebly.com/uploads/1/3/2/7/132712266/zidokavakosaz.pdfIn PDF document text
    • https://fajesafopumusid.weebly.com/uploads/1/3/1/8/131871419/zumurof_nevep_mefozebos_wobapuke.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/jh378ha/kovutetugaduxonenekazu.pdfIn PDF document text
    • https://fiviwadixuxenel.weebly.com/uploads/1/3/4/8/134854304/cab8ae267.pdfIn PDF document text
    • https://vopezewom.weebly.com/uploads/1/3/3/9/133988608/kakojoduvojo.pdfIn PDF document text
    • https://kalanuwil.weebly.com/uploads/1/3/4/6/134634674/8185485.pdfIn PDF document text
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/1621501.pdfIn PDF document text
    • https://cdn.sqhk.co/lonubugogere/gaifJhd/jixot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_60141103495e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 4956 bytes
SHA-256: b690e4db2e81ff01fbe3d1fab7ac8749d2b64658e2059c63d691ab65b0fc1deb
font_01_sfnt_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 10072 bytes
SHA-256: d7321e1f7180790275014719ef05d964f7f84f0cc6fc67e6ab32731fdc5870e4

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