Malicious PDF — malware analysis report

Static analysis result for SHA-256 275da0bbaf0e3c3a…

MALICIOUS

PDF

66.9 KB Created: 2020-11-14 10:03:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0ba97fc66aaaa918393eb4d9cdde319f SHA-1: 554662ab54562fc5fca57bd1082cd90bb087fea5 SHA-256: 275da0bbaf0e3c3a7abbc071d145d47ff62a2e5746104ac913cd5dae52bccec8
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Huniecam studio download apk', suggesting a lure for potentially unwanted software or malware. The presence of numerous external PDF links further indicates a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/strik?utm_term=huniecam+studio+download+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5f9862eda4b4f.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/dasaretatesufovixaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f94d8aa65833.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/814eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_5fa09b3aa951e.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/7968078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_5f98eb9063aad.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/butuborinir.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://uploads.strikinglycdn.com/files/048e1ebe-86b4-416f-8f44-7d790042e184/dorul.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/mw_guns_real.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31b5650-885f-4405-ad5e-da630a0c8e6a/49037297201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9662c7-8988-44f5-9ad9-e753f62296b3/95166206790.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/adelita_cinderella_story.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_off0000ba5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5D 5124 bytes
SHA-256: 85cb98cd80dfe44a80d802be118cb131ec0cb4fa7ea3ae0e3cf3e1249940204b
font_01_sfnt_off0000cbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 11116 bytes
SHA-256: a2e0c7fca2ec2580cb7898421894fe7f7129efe07b877c0a47df4d75c6697d8b
font_02_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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