Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a26f3e153c557fa…

MALICIOUS

PDF

85.9 KB Created: 2021-02-15 17:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 92d9ede84615a8daab9b5331caced4ea SHA-1: 3ab56191072275ba62956ec04ed2bfcad0d88dda SHA-256: 8a26f3e153c557fa11d45ae93bf4f1adabe21c4adde4efef56ec97c9e3dd64d3
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links pointing to external websites, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links to potentially malicious sites is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=rainbow+magic+series+book+1 In PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/04953fc86eda49.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/vopavaji-xasofifuvamobu.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/3cc4d4e94af9a6.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/3386626.pdfIn PDF document text
    • https://xalojuxovev.weebly.com/uploads/1/3/0/7/130774978/9382536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_6013f5ed61aaa.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/883905.pdfIn PDF document text
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/tuzeve.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/fifeborasof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_602a1f810116c.pdfIn PDF document text
    • https://bomefojidog.weebly.com/uploads/1/3/2/6/132695402/3e676eb3bf.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/tumuzu/wastewater_treatment_plant_operator_certification_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/kesaso.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/72667017355.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/togaxexibas.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_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 5148 bytes
SHA-256: a7a31f56024adda93df9e31aba5d7ccb87832d8cd67b6311e6babed053910a48
font_01_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 11732 bytes
SHA-256: 5562258c9340a522d60787f3c831851bd7badcd3c9d56912f6c9c9d172ed7cc9
font_02_sfnt_off00013b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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