Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b78eb10b35211ec…

MALICIOUS

PDF

70.2 KB Created: 2020-12-16 20:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8d090ec5e1e5a8cb5dd582e20594f8ca SHA-1: e3d715f57de468bdddfd086c2d428bc3cc1efc49 SHA-256: 8b78eb10b35211ec49cd9e41efd7701a486e7475a5c070d32edbc8ac5bde37c6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure. The presence of numerous external links, including one to a potentially malicious redirector and another to a file named 'fornite_apk.com_dowload.pdf', strongly suggests an attempt to direct users to malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffmen.ru/123?utm_term=el+credo+oracion+youtube In PDF document text
    • https://kagafalevusina.weebly.com/uploads/1/3/4/3/134368330/9203840.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/daserow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5fbd64807f5b9.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/8871445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f8be3ab03858.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
    • https://uploads.strikinglycdn.com/files/067aa66d-1d4b-4e29-bc68-2377c67cf622/fornite_apk.com_dowload.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0baae3dfdd95b60d439b1/t/5fc31c359ee0f32b87b98b79/1606622267524/waviwugebibibulibesado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea602b70-0791-472f-9716-123cff3d0e88/concrete_nouns_and_abstract_nouns_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e58dad-a08e-45cc-a05f-4514430960cf/rational_numbers_be_negative.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4cf626609fd0ee7aa7f01/t/5fc51ae79b1ed035387fb5ab/1606752999743/43063626747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349357cb-718c-4521-98c6-2c10189e0033/36773465265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec00c123-fc3d-42b4-9ba7-488c6585cae4/kane_chronicles_the_red_pyramid_weebly.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 4836 bytes
SHA-256: f215a6e323925a43e5e4a3da113d0fdebecf1b73c50fff9642cd0f5387c85812
font_01_sfnt_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 10820 bytes
SHA-256: bf5c37f6db82139c54bdf9372bd5e6c3da0556e16e6aafdd88e1286c3eccb2c9
font_02_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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