Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a8923d0615e4f0…

MALICIOUS

PDF

78.0 KB Created: 2021-02-26 17:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1156b11e097e5758c9c05b14ab735827 SHA-1: 351c57c5521026e0fc4abfeb76bce10714b0378c SHA-256: 35a8923d0615e4f067c28eb65416ae89b9367d813449de075b07aa201d8b7d50
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded URLs point to suspicious domains like xajibur.ru and various weebly.com subdomains, likely serving as lures for further malicious activity.

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
  • 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.
  • 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://xajibur.ru/award?keyword=what+did+the+elephant+man+die+of PDF link annotation
    • https://bujakisuka.weebly.com/uploads/1/3/2/6/132695398/330772.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/397191a0af.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/how_to_put_ink_in_hp_deskjet_2545.pdfIn PDF document text
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/fiduburusuxenav_lemibov.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/pekakalizik.pdfIn PDF document text
    • http://nukels.xyz/gimosorovavovezusaq0eq.pdfIn PDF document text
    • http://vuzopozakobepe.22web.org/macbeth_act_3_comprehension_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_601818e6286b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_6036d3fd5be40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_602b25617c2d6.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
    • http://fepesori.rf.gd/tetejusozoxegobo.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/panasonic_hvx200_century_fisheye.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/nudizeririronexovuzifew.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_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 4808 bytes
SHA-256: 914a177e01d78f393d25fb593f28d6612815b2a442d9813a8db478680f19cad7
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 10240 bytes
SHA-256: af84efe6999326606ed515ac95111de43e5d3e5665b4e143b1f7611b075cd0d9
font_02_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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