Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98d8cb4a08eaf09…

MALICIOUS

PDF

79.3 KB Created: 2021-02-20 06:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9b2ed2a3b69b798cf5683add1fdaf201 SHA-1: da2a94c1e1e3b07d18b7ba7332257da79b0b6709 SHA-256: d98d8cb4a08eaf091f49a5200e5a869c5439662b3aa4a7191296f062980c52d8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/123?utm_term=how+can+you+tell+if+your+air+purifier+is+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453117/normal_60247b19bb4c4.pdfIn PDF document text
    • https://savakofanedekin.weebly.com/uploads/1/3/4/8/134872369/443e2f8b4.pdfIn PDF document text
    • http://grizhoff.ru/influencer_marketing_agency8u9vn.pdfIn PDF document text
    • https://zolowokixo.weebly.com/uploads/1/3/0/7/130738875/fesetodomojodut_zulagitakame.pdfIn PDF document text
    • http://my-favshope.online/counting_coins_worksheets_3rd_gradesla48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426545/normal_5fffb64629333.pdfIn PDF document text
    • http://marafonsport.site/44706186910ndqrp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481406/normal_60038cf63094b.pdfIn PDF document text
    • http://italia-doc.fun/dnd_3.5e_players_handbookult8a.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/varaxododokofap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zakunafu/honey_bee_images_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/sheet_music_for_in_the_bleak_midwinter.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/xitajorivagoruxer.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/xijumomesijowivoxofivara.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/86135386263.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/canadian_cardiovascular_society_s_dyslipidemia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/crazy_in_love_eden_piano_sheet_music.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_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 5400 bytes
SHA-256: 89dcc0df46402d206adbb086f43bac706b51e5ea9bf82a2608d7e99a54822114
font_01_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 11644 bytes
SHA-256: 500d4a9b4eca9a30be66e9f8cf3033849156ab7452899c841808681f1973e36e

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