Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca000558b35eb194…

MALICIOUS

PDF

69.0 KB Created: 2021-03-04 20:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 443f7263073e79897a107b3ca6c4e182 SHA-1: 5ba26af66cfb5f58aa7712d9aa2ede989876a857 SHA-256: ca000558b35eb19437a96c58b9cac04a1004c521326948783f75701ae2adaa45
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan distribution attempt. It contains a large number of embedded links, many pointing to disposable hosting or known malicious redirectors, suggesting a link farm designed to distribute malware or phish credentials. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/123?utm_term=what+can+i+make+on+a+george+foreman+grill In PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/xupugu.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/a72f4.pdfIn PDF document text
    • https://gesaseli.weebly.com/uploads/1/3/1/3/131379828/kenubanapewok.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/nexusikul.pdfIn PDF document text
    • https://xipazodi.weebly.com/uploads/1/3/4/3/134375507/buwis.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/8307083.pdfIn PDF document text
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/wawesejadad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/beda1793-106a-4609-83a7-e4db8843aabc/what_is_the_best_compact_countertop_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294fd2d4-f27d-49c0-b71b-ede11c7e9ce0/37610083615.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_ea2fd1b908154d08bd72bc6318183784.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/251c2a30-702f-4fe2-a260-cd8adfdf6bb8/lg_lp0814wnr_hose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b4ed0d-eaea-440c-a6dd-eab5f5d44419/19814221353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eef0978-141f-48b4-8813-03dc5acb8e39/best_institute_for_interior_designing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d14cef-75ce-47f5-9687-34b92a2f4075/siliwubalawaxokimuvozoro.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_0b8d8114811047e7b7ab384af7593229.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_fd0a0e0d8f3a43a98097321ae44f00d9.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_158b9c1eda864ec9bfe78de1fcfa130f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e52bf1-d035-4878-8769-8db04df7449c/tabibogaxe.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_off0000d319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 5192 bytes
SHA-256: c99acf27d3006555314a118a684593647ab6f3018b83f28b5d5c3515a8fc8250
font_01_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 10188 bytes
SHA-256: cd5059ec57825b68ae91b8d3e77fd8dcc1291a64688253b1e556fa255e5a305f