Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac167d5b39072c0d…

MALICIOUS

PDF

75.0 KB Created: 2021-05-23 14:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0174a315798c5b3bd867c763c4fdf9ac SHA-1: d07c3208dbed9794e134f8da56bc9d8c9d3bbd83 SHA-256: ac167d5b39072c0dab9a3ae2568042cb0ff5a9f5d8622b99c61c501348729b1a
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body mentions 'Apex launcher frp bypass apk', indicating a lure to trick users into visiting potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=apex+launcher+frp+bypass+apk PDF link annotation
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/836288071009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503791/normal_5fe6b392b387d.pdfIn PDF document text
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/jamijikos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_604cdc0bd67ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369142/normal_5ff4b3dec4c3c.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/305410.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/jizilivoriku.pdfIn PDF document text
    • https://wizisenax.weebly.com/uploads/1/3/4/3/134320615/1110857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_6017176e42e90.pdfIn PDF document text
    • https://lixebofupasiwik.weebly.com/uploads/1/3/2/3/132303312/0ccd73d.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/dekitesoxiwofepaxudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_603069b3c72a4.pdfIn PDF document text
    • https://vewominejijisos.weebly.com/uploads/1/3/6/0/136053907/8358d8dd4f3621e.pdfIn PDF document text
    • https://momimuraw.weebly.com/uploads/1/3/1/3/131384495/kunumesoximit-girakogopibapij.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/95d8e842-3020-4e8b-944e-15bdae03c530/12791094170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42906cb-1fc1-4b2c-94fa-a57645fa5ae3/54556792505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8e3db6-14d1-4b17-bbf4-a4b1ac03427d/human_geography_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541e8d6c-913b-4466-b1f7-c1f3e0b9ab0e/95815181079.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_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 5468 bytes
SHA-256: 10c9caa73d7d5fcce36be5a5228eacb2b260b74ebd08ba4cef4d66b57248e880
font_01_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 11096 bytes
SHA-256: 317e733f58c11a41b1a2a1eb32cd5d493cf1bc420ebd20136a7138c7215c33d6

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