Malicious PDF — malware analysis report

Static analysis result for SHA-256 b698115117bbc7ca…

MALICIOUS

PDF

70.1 KB Created: 2021-03-23 00:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ed1321596c39d639fcef80fabe5c25d6 SHA-1: 99f906111e3afbb866281762564b542aa0143dc7 SHA-256: b698115117bbc7cae0d9ecb770c520848fd060e6f2f80b764b08812660d66cb1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://yafferge.ru/award?keyword=cell+differentiation+journal+pdf In PDF document text
    • https://vumirexow.weebly.com/uploads/1/3/2/7/132740730/3070755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5fcb07d699c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_60215bb5586dd.pdfIn PDF document text
    • http://dragonflysagewellness.com/38686727368beqod.pdfIn PDF document text
    • https://fototinuvanumef.weebly.com/uploads/1/3/1/4/131406749/mufiwifixaj-lapokefudele-fosexi-sakijibetok.pdfIn PDF document text
    • http://tekchambre.xyz/spring_resttemplate_connection_timeout_vs_read_timeoutt048x.pdfIn PDF document text
    • https://morarinaxi.weebly.com/uploads/1/3/4/5/134528003/2713552.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5ff5fdff93262.pdfIn PDF document text
    • http://idealicaitalia.website/bush_s_baked_beans_nutritional_informationk5vjo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485821/normal_5fe841e3b3cbc.pdfIn PDF document text
    • http://zvezdasevera.online/crazy_dragon_globalbpei0.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/998f946bd873c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5ffc93197ba07.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/viwoxuz/casio_forester_watch_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/263b2cec-ce1d-429c-9b6a-49a233495bfa/kumedudarad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb6b299-4027-4284-b4b6-d6c1c9a2bd41/genitimusemenewuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/gimabeloramiborozeta.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_1173fec0102148b78b8968072673e11b.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_044f8cfc768e4e7883d9799cb424fb7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/38824864581.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_218543018eb84a0db00a7f74508d0ce0.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_67e168e3e32641a3b971677990f464f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomudufe/zusatuninadufusum.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_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 4840 bytes
SHA-256: a8bda7fa59968a8d1f2f7b20b2dc3bc05d5a79e6c676ce714bbbc181180a19c3
font_01_sfnt_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 10936 bytes
SHA-256: 1af730f1cb2cf1f3ffd42eb7b62502aae8a434ec9ea1bedb0ea4ab0b83408c6d