Malicious PDF — malware analysis report

Static analysis result for SHA-256 398b1a14e4838f4c…

MALICIOUS

PDF

73.4 KB Created: 2021-02-09 11:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f88f662956cef381f8f12b00be0701f4 SHA-1: 5381010715a704e0efc41af22da2579d0aff6fea SHA-256: 398b1a14e4838f4cb5aba2b60bb30011d80fbe4224100986ac001b97acc34018
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, and is flagged as a link farm. The primary URL, 'https://leonvi.ru/aws?utm_term=adventure+academy+app', suggests a potential lure related to an 'adventure academy app', which is likely a pretext to drive traffic to the link farm. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content.

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://leonvi.ru/aws?utm_term=adventure+academy+app PDF link annotation
    • http://pimavegi.22web.org/bst_time_now_in_24_hour_format.pdfIn PDF document text
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/mogagudetewo-sujefemolu-wufofinigufu-zezuvazugivaba.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/9285771.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/5367027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478685/normal_5feff3ec3a040.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394071/normal_5feeb133d44aa.pdfIn PDF document text
    • https://fowaloxew.weebly.com/uploads/1/3/4/8/134881160/7a203865a98e04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5feb4b7ba7adc.pdfIn PDF document text
    • https://xupajipodiburut.weebly.com/uploads/1/3/0/8/130814024/pebareriromuzat_rofesujulesobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_6016d3608789a.pdfIn PDF document text
    • https://sunejojixin.weebly.com/uploads/1/3/1/0/131071277/02f96894edf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/lancing_device_accu_chek_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/mupinijuvamor.pdfIn PDF document text
    • http://ledudixip.epizy.com/mesemisazokejofepul.pdfIn PDF document text
    • http://puxejinasor.epizy.com/geboruximekejazejak.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/92826505782.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_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 5160 bytes
SHA-256: b4e8622637110c6a78957fde9f656a5914018e05f5a8152ad3f431e1e1ef9aa1
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 10708 bytes
SHA-256: 6c146e6c9be3264fe41a040f45bb91572cbfd25ddce5a187d8ced216d5eda020

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