Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e31cbb2a915370…

MALICIOUS

PDF

73.6 KB Created: 2021-02-28 09:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4a010ace867b9a02f555de760c7f207e SHA-1: 416c9c2427e86642643e6b30887d18ec530bc5ef SHA-256: 31e31cbb2a91537001cc3bd78b879a8781d86d777a8a3c6331949b26e8ac70c8
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to PDFs hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were directly extracted, the presence of external links and the nature of the heuristics suggest potential for exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://maypoin.ru/wix?keyword=ib+english+paper+1+sample+commentary+prose PDF link annotation
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/90dfd48dc55c0c0.pdfIn PDF document text
    • https://lobobofu.weebly.com/uploads/1/3/4/6/134680821/jumifobobigokumu.pdfIn PDF document text
    • https://sunivisoxeban.weebly.com/uploads/1/3/4/4/134493344/zagemipetufifot_nurukerigiwug.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/eifmjdw/word_families_list_for_kindergarten.pdfIn PDF document text
    • https://lopifonexebifi.weebly.com/uploads/1/3/5/9/135986218/mediruk-nolapej.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/jihbaRt/curling_iron_3d_model.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/xuvaw-mamin-luledulelu.pdfIn PDF document text
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/8975599.pdfIn macro / runtime command snippet
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/6e51d482.pdfIn PDF document text
    • https://denesibupu.weebly.com/uploads/1/3/0/7/130774977/veliforimagaku.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/huhzjb2/color_circle_car_stickers.pdfIn PDF document text
    • https://vigelabed.weebly.com/uploads/1/3/4/3/134368569/wumezefovupa-wojifo-xixosodelikap-pabopujoguvawef.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uplIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/electromagnetic_radiation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/aviso_de_privacidad_telcel.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_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 5580 bytes
SHA-256: 69a2550f85f720f6cbfd98841ba44760767fcf3b2438aee679aba7870c7cb699
font_01_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 9632 bytes
SHA-256: ddb8d48016a10d70d9dc541620e2f6d9ac3bd22d6b75c9abdd5203cb64799430

Open this report in the interactive analyzer, or submit your own file for analysis.