Malicious PDF — malware analysis report

Static analysis result for SHA-256 a623ca5e0e44a4c2…

MALICIOUS

PDF

76.9 KB Created: 2021-03-19 05:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c38b67af22d51bb35b0519505a7b7056 SHA-1: dab60007f3fba07140a256536c0b5e02b9b1b9eb SHA-256: a623ca5e0e44a4c2e6225f87aecbca1436d85fd6a49b8a5d2c7a2b77f1e70339
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 of which point to disposable hosting or unknown domains, indicating a link farm designed to direct traffic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/aws?utm_term=eastman+tailor+22+stitch+rose+gold+sewing+machine+review PDF link annotation
    • http://btsworld.org/chhoti_si_aasha_mp3_song_downloadyt9gg.pdfIn PDF document text
    • https://juzifadolugigom.weebly.com/uploads/1/3/4/3/134324721/manunerulefij.pdfIn PDF document text
    • https://kugixixubeleji.weebly.com/uploads/1/3/4/3/134324677/maxaku_letilugawip.pdfIn PDF document text
    • https://tuxedibuzi.weebly.com/uploads/1/3/5/3/135350702/tanodafenesa_niwov_vurusaserim_xupaxaxexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_601998763a4cd.pdfIn PDF document text
    • https://wugovaxovagebi.weebly.com/uploads/1/3/0/9/130969592/60d4d20694e2.pdfIn PDF document text
    • http://gatorama.fun/labyrinth_of_the_witch_guide1eql7.pdfIn PDF document text
    • http://grigolia-studio.ru/gigivixenixixalatipabuka3ggxe.pdfIn PDF document text
    • https://bosuditibopo.weebly.com/uploads/1/3/2/7/132740628/5d56036b112014.pdfIn PDF document text
    • http://babbieshop.ru/227493762743i5ox.pdfIn PDF document text
    • http://stikc.xyz/warukesuvugaro1zsy2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_605281a68b209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443815/normal_603288a0e5d56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443594/normal_5fed7c843c1d8.pdfIn PDF document text
    • http://storeplus.pro/poetry_is_what_gets_lost_in_translation_robert_frost6lusx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/283085be-1e71-482c-ae6a-ef69ee258b8b/listado_de_conectores_en_ingles_y_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9f8679-18e3-4831-9e2d-6257517e5871/stretching_exercises_for_senior_golfers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/effbe83e-ac3f-40ee-9c08-6d2a7e17566c/jiputesajejasozinuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a70f262-2bc7-46fb-a225-38252b25790b/html_css_javascript_ebook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0545b842-753d-4d59-9406-56213048f7e7/67140932043.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_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 5596 bytes
SHA-256: 7c3acdb44fe1e44a40b683a01a21fab390f85061f0c688f4bbe61601181013b0
font_01_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 10820 bytes
SHA-256: 6e1b0f1385198b9751726975c7113dcee39997ec3c96a8082903de6942d9f0da