Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5887ac5f0bc2006…

MALICIOUS

PDF

75.0 KB Created: 2020-11-14 08:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3c111a21aa81e6c7a4399b2d97aa7ec7 SHA-1: 0986baa6ce484b8b854b7be722492e3be9827502 SHA-256: c5887ac5f0bc2006582487a89d41afe302616d32d587cb22da9afe7d5cfa3103
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged as malicious by multiple heuristics, including a critical finding for a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of a malicious redirector URL suggests an attempt to lure the user to a harmful site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=marcos+poplawski+ribeiro In PDF document text
    • https://sidonakitipu.weebly.com/uploads/1/3/4/6/134631457/5393844.pdfIn PDF document text
    • https://velabusodogir.weebly.com/uploads/1/3/1/8/131858366/0452f237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_5f9e8ba45036b.pdfIn PDF document text
    • https://fetofopup.weebly.com/uploads/1/3/4/5/134507679/vodesuvu.pdfIn PDF document text
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/juditibamepakoxivuze.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://s3.amazonaws.com/potamotaz/vazizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40441b1e-c9d9-41af-a59a-64b87d7b397d/minecraft_transformers_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/hobo_spiders_in_oregon.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/45186374706.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/jekowotabajitofapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74d47d7-0661-4645-8404-3ada8ee6c425/tedikeronitev.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/22198012246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e403872a-2489-4bed-bff6-e70f6e3550e4/81228694786.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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 4828 bytes
SHA-256: 2a31ff44a6537f497b6a7d2d6a187a81bc05498c3ad887b6573d99a76aa7ad1d
font_01_sfnt_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 12704 bytes
SHA-256: edcfb106c0e4d0b88c36ea8289215e5e25e164e52aaa41486da939ab742748e6
font_02_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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