Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e655eb95672911…

MALICIOUS

PDF

79.3 KB Created: 2021-02-21 04:06:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 34d00b4207139790d463f0f2d737a0ca SHA-1: 4739297341175502fc0363c95feabcc3e2e587af SHA-256: 43e655eb95672911027f2e990cdd4c4f9f0d77ba9800099d0ee19b3136af8d90
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=hack+games+apk+coc In PDF document text
    • https://dazifefizax.weebly.com/uploads/1/3/4/8/134854215/pajopimaguda-gemumuvumiriwi-vumelozakap-rajafuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_6025157765d2d.pdfIn PDF document text
    • http://hhizmet.com/596602602305lf0y.pdfIn PDF document text
    • https://luxutavu.weebly.com/uploads/1/3/5/9/135964445/b88578.pdfIn PDF document text
    • http://newyearshop.site/63567041214doabn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488090/normal_600d4acc543d2.pdfIn PDF document text
    • http://ru-dev.xyz/causative_form_testzls0k.pdfIn PDF document text
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/nalifugik.pdfIn PDF document text
    • https://kujivapepomo.weebly.com/uploads/1/3/4/5/134591142/8569775.pdfIn PDF document text
    • http://trendmobile.ru/lelekizodalupefakajexasff841.pdfIn PDF document text
    • http://paxiwanaje.iblogger.org/vazozazewa.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/2427715.pdfIn PDF document text
    • https://rebuxikaxaj.weebly.com/uploads/1/3/4/6/134668288/vojumijunowepas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5fd19ae055bdf.pdfIn PDF document text
    • https://mobefoba.weebly.com/uploads/1/3/0/7/130776725/e169f5444cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sarososibi.rf.gd/free_casino_games_slot_machines_no.pdfIn PDF document text
    • http://nadiripu.epizy.com/categorical_or_numerical_data_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/63007175213.pdfIn PDF document text
    • http://tinejamuwaki.epizy.com/airtel_4g_dongle_setup.pdfIn PDF document text
    • http://nuwumunis.epizy.com/37869223657.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_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 5148 bytes
SHA-256: 0f8d1d16e9d5d877e917d02c85e1f6d966c0b1d23d0e94b85f178819503ac7c6
font_01_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 10136 bytes
SHA-256: 11a2311149742505cdf23e101242e0792221bda40fc8d38f68447026fb9dd988

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