Malicious PDF — malware analysis report

Static analysis result for SHA-256 987229e1e8215192…

MALICIOUS

PDF

75.1 KB Created: 2021-03-09 23:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 287f32ebd09d9a5592b443d6dafe3d32 SHA-1: 53feba439d3dc4f078f069adc87f510cecec0b9c SHA-256: 987229e1e8215192f6484406a89f00d5ed4e464da17bb15b51965c71a510ddd6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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.
  • 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://lozipotod.ru/wix?keyword=the+essential+epicurus+pdf+download+free PDF link annotation
    • https://xududegugi.weebly.com/uploads/1/3/1/6/131636960/1b193d5114c388.pdfIn PDF document text
    • https://wawizaliw.weebly.com/uploads/1/3/3/9/133986908/7622875.pdfIn PDF document text
    • https://jusodizepo.weebly.com/uploads/1/3/1/0/131070216/6353262.pdfIn PDF document text
    • https://jebupamix.weebly.com/uploads/1/3/6/0/136098333/gorekalalatam.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/belimasujeneseja.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/kuvevebizawurog.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/sifova-migibitod.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/pixigi.pdfIn PDF document text
    • http://kulanefimolon.mypressonline.com/hp_laserjet_pro_400_color_m451nw_driver_windows_7_32_bit.pdfIn PDF document text
    • http://dolanuja.iblogger.org/2018_telugu_calendar_free.pdfIn PDF document text
    • https://tabofeluraratub.weebly.com/uploads/1/3/1/4/131438776/fisatomuro-rimib.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/c598fdc1d6.pdfIn PDF document text
    • https://kazawiluk.weebly.com/uploads/1/3/5/3/135384823/rinoluzuxotad_wegilugalawof_faxofebunogex_juzovizosinek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopolug.myartsonline.com/what_is_an_example_of_a_smart_target.pdfIn PDF document text
    • http://balubusepebibi.rf.gd/35188660525.pdfIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_3a6366165b1e4484bf04cfa740cd1554.pdf?index=trueIn PDF document text
    • http://fedasumenusum.rf.gd/lototifaxunutobawevajab.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_67dd952fa9b24693a63dcc2d8a3385ba.pdf?index=trueIn PDF document text
    • http://tuvufuxo.epizy.com/51801148376.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_c6e8e4d9d351462aad1f1d2498598668.pdf?index=trueIn PDF document text
    • http://fekidet.rf.gd/98208676838.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_b581cd295163411abb9ba9b9d8ded4bd.pdf?index=trueIn PDF document text
    • http://nigugolesaxof.rf.gd/99458178062.pdfIn PDF document text
    • http://gokosipok.rf.gd/amar_chitra_katha_mahabharata_amazon.pdfIn PDF document text
    • http://matazovazer.epizy.com/77464824997.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_53d810def9a24221bb44eafa39b74ec4.pdf?index=trueIn 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_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 5284 bytes
SHA-256: b709f3ed7774ef1138b013e09119f7a0ed47bc4586915d0e94b364ca13381b7d
font_01_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 10196 bytes
SHA-256: 10084a8c964e9a9af3cf2e990a20bb312ae32fe34b4cf6e4642b8ca95d991e54

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