Malicious PDF — malware analysis report

Static analysis result for SHA-256 c428dcf31e329f61…

MALICIOUS

PDF

75.2 KB Created: 2021-05-05 14:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 08085059b3ae73d2b360ce300b729828 SHA-1: 023928687d2774f2da67941d2514c23f81a0c8fe SHA-256: c428dcf31e329f614031d4e6f041f23ffa047703dcf7c9d325781b7770a3e7e5
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or phishing attempt. The presence of a malicious redirector URL and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to 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://dafemum.ru/strik?utm_term=how+to+get+rid+of+a+pimple+on+your+lip+in+a+day In PDF document text
    • http://bahis-sikayet.com/pewopawitigewiwobadexela1l.pdfIn PDF document text
    • http://bred-enligne.com/trigonometry_introduction_ppt_tesxah1q.pdfIn PDF document text
    • http://glasshookahcatering.com/reddy_heater_35_spark_plug8c71n.pdfIn PDF document text
    • http://clientbluebadge.com/xekerizifanilinozusuwobuztbnh.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/xofepexamixe.pdfIn PDF document text
    • http://krokoboko3.xyz/kali_linux_raspberry_pi_2_downloado2qm8.pdfIn PDF document text
    • http://idealicait.site/5503115270ohevt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_603791f7519fa.pdfIn PDF document text
    • https://darefosal.weebly.com/uploads/1/3/4/6/134601331/3710b23410e7976.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/favorofapuwires.pdfIn PDF document text
    • http://premiumpornclips.com/76645276070c1ryc.pdfIn PDF document text
    • http://svoytrylend.xyz/29729221750bflc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444622/normal_5fcda2d16949e.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/2b11fddd-e2bb-4271-8117-1e5eb24d64fe/why_is_fifty_shades_of_black_rated_r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2402804c-a367-4590-8efd-111f09f3408e/zuxixavageluf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/164dee60-079f-4053-bd85-96cdb6e81efb/mezudufasovisajujuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfcfceb6-ba31-4fd5-ba30-bf6771e2e8a6/42476020542.pdfIn PDF document text
    • http://nepupiborama.rf.gd/guided_meditation_script_deep_relaxation.pdfIn PDF document text
    • http://walofasokim.epizy.com/sekiwavaz.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_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 5340 bytes
SHA-256: d7473b445486e386323f715b49f320d6f46b43c194665185d5e6a0bf12f94ba6
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 9864 bytes
SHA-256: a42f8d6510526c6ad4cc39dc27f214b4859f8fe02643335d76ee7efc34c571de

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