Malicious PDF — malware analysis report

Static analysis result for SHA-256 d024bb11243837f1…

MALICIOUS

PDF

100.0 KB Created: 2021-03-10 18:32:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bc6cdad1285bfdc9e7684c384453e400 SHA-1: 5929f874769dd2a80a8757c0bcda9907349ea0ee SHA-256: d024bb11243837f1dc5f80bb5fd0d916774fe092bf7b899f23a1204054e9f56b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be related to search engine optimization keywords, further supporting this. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/award?keyword=redlich+kwong+equation+of+state+pdf PDF link annotation
    • https://vopemafewiza.weebly.com/uploads/1/3/1/4/131408930/napopex_migitolavo_guzukusidap_pamikusurez.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/82334377.pdfIn PDF document text
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/c32db02fb4a6.pdfIn PDF document text
    • https://juwizezajofop.weebly.com/uploads/1/3/1/6/131637218/6012759.pdfIn PDF document text
    • https://pigaxapi.weebly.com/uploads/1/3/2/8/132815084/a58d74a6ae2d35.pdfIn PDF document text
    • https://ladolijid.weebly.com/uploads/1/3/2/8/132816107/7398528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406793/normal_5ff94918d1838.pdfIn PDF document text
    • https://xodumusekow.weebly.com/uploads/1/3/4/7/134708755/podisi_sukabegigaziwap_bodabaluro.pdfIn PDF document text
    • http://naturmilans.fun/xufepobidukezoforef5s3f.pdfIn PDF document text
    • https://kuwuxegizeduki.weebly.com/uploads/1/3/2/6/132695805/puvusiriwul.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/xojosi.pdfIn PDF document text
    • https://derifopo.weebly.com/uploads/1/3/4/4/134490925/kejadopujopate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5fd322d435d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_6025c324cd2a0.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/1f675ed6cc85b.pdfIn PDF document text
    • http://buyfastedcircle.xyz/ruvesagebixaniohe29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_6038919c57853.pdfIn PDF document text
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/vuxot_doworapuketixi_potatilano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_6030f62ce7b78.pdfIn PDF document text
    • https://pemimitajeli.weebly.com/uploads/1/3/0/7/130739011/nozepizoz-ponupotosom-zekufexape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A84 5492 bytes
SHA-256: 89950d32850bf20fcfc8c3f65ce3db0ce08786c746f334e6bfad0560a83daa5c
font_01_sfnt_off00013d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D38 17784 bytes
SHA-256: dff9ef49688cc629caab70e65502cd61678b456504a1d2e683671c1ebcb09c98
font_02_sfnt_off000174bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174BB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c