Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23aa7f97332212a…

MALICIOUS

PDF

80.4 KB Created: 2021-03-25 11:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 16a686798285f71e7c2e8d301503db3b SHA-1: 0e3600d549342affb3cfd39fb0635221cbc1ba48 SHA-256: a23aa7f97332212a655980f388692517c772d86c21749990b5b9281c9af5970c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute further malicious content or phish users. The embedded URL and the link farm structure strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/award?keyword=juice+box+bully+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408993/normal_5fcb436d5c0e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_603655aa1dad2.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/547684267261.pdfIn PDF document text
    • https://cdn.sqhk.co/wutijiwatar/M2hjhe3/vigope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484375/normal_60407f39b7032.pdfIn PDF document text
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/tugipibebumope.pdfIn PDF document text
    • https://derebadinexito.weebly.com/uploads/1/3/4/0/134012579/tiwukolilofuxa-varevalegakuw-rukugulimipem.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/d72hdjr/55582044448.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/Rptiaia/1000_words_equals_how_many_typed_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/jiyhjCI/toca_life_town_1._5_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_60378c4ee4b2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_6035bae12d2eb.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/tchbigp/merge_dragons_cheat_codes_ios.pdfIn PDF document text
    • https://tixuxajus.weebly.com/uploads/1/3/2/6/132682254/wewixa-setaxikuka-vigavuviwiwetuz-bexiwapotujaz.pdfIn PDF document text
    • https://nokivuvaxeg.weebly.com/uploads/1/3/4/5/134594014/4760143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452607/normal_6007ea6b75f9c.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/7358b4ea-6070-44e8-aca9-b560c730ee6c/the_definitive_book_of_body_language_audiobook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d33ef44-dde3-487f-b18d-a35c112db6cb/what_is_a_challenge_drug_trial.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_66ff56894afd49fda82663affb6b23a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32c4d39-60d2-49ca-a793-a6c8e20bff25/xutopow.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_79d882ae2ee146a0b9add571bfa60a3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1e7b5b-dddf-41b7-a7f5-926a77227faf/23737667682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae51100-9081-4685-a830-42d6213db9b9/pyramid_principle_summary.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_a9f33a5be5b2446ba65297bfbb352417.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_d59b59104f7c4f39b029b0870073a7c1.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_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 4964 bytes
SHA-256: fba5b74dbb8ad87230499f140af3ff0477fc5130f928b95c52dd6b505d8f8eb4
font_01_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 11336 bytes
SHA-256: 3dc331197ed71ea33974cca863c6482775939656ea50fba275c15468eed6a029