Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b22e334929bcc2…

MALICIOUS

PDF

83.8 KB Created: 2021-02-25 12:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 26eacdba5767f6f1703f02f0e01269bf SHA-1: 7c20c572de8ed262819adb8790389bdaff8694ce SHA-256: 42b22e334929bcc2610d70b1cf78085866fb024c50f5bc2f21e3f124405c0292
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services. One of the primary links directs to known malicious infrastructure, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=when+to+start+applying+for+air+force+academy In PDF document text
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5fcebe6c38161.pdfIn PDF document text
    • https://satoteje.weebly.com/uploads/1/3/2/6/132682597/logod.pdfIn PDF document text
    • https://rawunixu.weebly.com/uploads/1/3/4/5/134527334/1835881.pdfIn PDF document text
    • https://tefuvaxijo.weebly.com/uploads/1/3/0/7/130739162/4066355.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/4866292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5fcf820024f13.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/9483e97e9.pdfIn PDF document text
    • https://rodetexozu.weebly.com/uploads/1/3/6/0/136096338/gunipokalolek.pdfIn PDF document text
    • https://lawejuja.weebly.com/uploads/1/3/0/7/130740077/236197.pdfIn PDF document text
    • https://suxaniwaxunese.weebly.com/uploads/1/3/4/3/134385499/5849806.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/hdujejh/smart_prepaid_promo_7_days_internet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417992/normal_5ff17b7e662c3.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/rifemase-wafevum-wedipow-porifelimutebij.pdfIn PDF document text
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/ab9389674.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/vizojekusurepubimesa.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/fa1fbb8b.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/figidireki/25245105336.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_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 5472 bytes
SHA-256: f666e974489a2b0f6aae6a4f3f2b96bdecd796a78245ea65ac93e7f0aefef7a5
font_01_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 10564 bytes
SHA-256: 0120a627c292f091c6d72134fabc30759f95710ab1f74e42e0732043bf8eec79
font_02_sfnt_off0001336e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c