Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d564a7ea347041f…

MALICIOUS

PDF

76.9 KB Created: 2021-04-26 03:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: adab1973a66d5f183970c7d74e61a2d8 SHA-1: 1c027d87908163dfce11fdfc839452aa188cfaee SHA-256: 8d564a7ea347041f862020d2b9187ebcad284f7eea6100832cadb9cc3ce2a0f8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains or link farms, indicating a likely phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

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://jumiwimov.ru/strik?utm_term=manger+dog+food PDF link annotation
    • https://cdn.sqhk.co/noruwotil/8ggi5uw/12220931166.pdfIn PDF document text
    • https://litefobobufi.weebly.com/uploads/1/3/5/3/135326689/faxaxolexutiv.pdfIn PDF document text
    • https://kujopupij.weebly.com/uploads/1/3/0/7/130740053/kadurodabe-bezufabaxek.pdfIn PDF document text
    • https://cdn.sqhk.co/puberufibo/egjjehj/live_camera_streaming_mumbai.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/dd593702b.pdfIn PDF document text
    • https://cdn.sqhk.co/kakolutezegu/ifBLWkp/gerolsteiner_water_quality_report.pdfIn PDF document text
    • https://bixagitiwor.weebly.com/uploads/1/3/4/6/134618264/59cdccd9afb.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/rZAjbyF/party_city_coupons_september_2020.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/janerogapukutapod.pdfIn PDF document text
    • http://gogadozuxigode.iblogger.org/siser.pdfIn PDF document text
    • https://zefemebok.weebly.com/uploads/1/3/0/7/130775969/fuxuseleri.pdfIn PDF document text
    • https://lakiliwurig.weebly.com/uploads/1/3/6/0/136089988/5575232.pdfIn PDF document text
    • https://xinemituvirow.weebly.com/uploads/1/3/4/1/134108685/2763059.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/9wifPjd/stick_battle_fight_mod_apk_android.pdfIn PDF document text
    • https://marelepo.weebly.com/uploads/1/3/0/7/130738501/2a4f9.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/8f6922625c6.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/ighd7LW/zokele.pdfIn PDF document text
    • https://cdn.sqhk.co/gugosobor/T2hdjaD/pocket_knife_repair_store_near_me.pdfIn PDF document text
    • https://vafomelopujoxo.weebly.com/uploads/1/3/4/8/134864043/c238fe75.pdfIn PDF document text
    • https://limopepubev.weebly.com/uploads/1/3/4/6/134627214/8664456.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jadogog.epizy.com/98371394202.pdfIn PDF document text
    • http://zadizufosa.rf.gd/giant_gourami_feeding_guide.pdfIn PDF document text
    • http://jonaxuso.rf.gd/tezutevimemi.pdfIn PDF document text
    • http://nenumezamotimi.epizy.com/dysarthria_treatment_worksheets.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_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 4868 bytes
SHA-256: f89ab0c8c2ce4e5f1686c2e4c213e30a36e29be9e32a7f80e6cfd4284c737203
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 11104 bytes
SHA-256: 1b29bbecbcad6d3d0160d368410969f92a336f3e64b00f625cde2dd11ec7ce9d