Malicious PDF — malware analysis report

Static analysis result for SHA-256 782f1549e80db5cd…

MALICIOUS

PDF

60.2 KB Created: 2020-12-11 19:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a01b5e1b6efb8d259613d736ad979fea SHA-1: 5f9ba06f2556d0ac125584719869dfd792220d01 SHA-256: 782f1549e80db5cded2a6eca72446229bd6671d29d9d3ca39a020149b5335f34
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The heuristic firings indicate a malicious redirector link and a link farm, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/strik?utm_term=dr+carreon+academy+lunch+menu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446287/normal_5fae70768137e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f87df6954e73.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/4124708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f8a61ab52405.pdfIn PDF document text
    • https://lakupemeza.weebly.com/uploads/1/3/4/2/134235705/ruximatuwugemel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483589/normal_5fc46a3aea802.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc3789f084698658e6e9449/t/5fc8aac74b97230d05125815/1606986439686/18095936814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b8af4fe-6e4b-4130-9e03-0a53bc6bb3e4/48031379393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe1076d-4f0e-4be4-b6dd-8bfd5cdf4ecb/sg-2_nsf_stainless_steel_manual_can_opener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2dfc638-2389-41ff-b6a5-2a87dc23ddb8/humminbird_788ci_hd_di_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75098274-a075-42ae-9997-6b135eb0b375/bazogojemamirazubop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e843937c-071a-4f07-be1d-bcd455c5f6ca/a_box_that_weighs_1000_newtons.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc794ae03f04e270fe55a11/t/5fcc54d9f94b6402b21041d2/1607226587585/super_snake_mustang_2019_specs.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_off0000b145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB145 5104 bytes
SHA-256: af8ea96eb314b3c8fbdb910932194b2e8239dc5ad1b248c1ab2f43d489c2cad4
font_01_sfnt_off0000c27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27F 10056 bytes
SHA-256: f700882f140500f6597acef95917f06cccad9e96e4fa58aa3e3f7e47ebe97cc9

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