Malicious PDF — malware analysis report

Static analysis result for SHA-256 f252e3bbdcde3a0b…

MALICIOUS

PDF

82.0 KB Created: 2021-05-11 09:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1c202f19fa3ad0e1e7009179012d86f3 SHA-1: d7e063ec79c1dd59e7fd6023231aae7392b9a264 SHA-256: f252e3bbdcde3a0be03604503d5eb326f595700aa47608e97e43ad3769b2c826
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, identified as a link farm. This is a common technique for SEO spam or to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/zusaju.pdf In PDF document text
    • https://cdn.sqhk.co/zubafena/goNjjR3/92549627974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_5fd7a04d5979e.pdfIn PDF document text
    • https://jowozulabu.weebly.com/uploads/1/3/4/0/134013075/2bcfcc35c.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/6914290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369149/normal_60039099b5d16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_6027c6be84c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_5fea37eea7df4.pdfIn PDF document text
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/disedowade_jogid.pdfIn PDF document text
    • https://subowenove.weebly.com/uploads/1/3/2/3/132303013/24c895f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_603715425818d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_605f72fda03b9.pdfIn PDF document text
    • https://zuvaxufar.weebly.com/uploads/1/3/5/9/135993026/6ca2c63e.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/hgCGifh/metoxujijani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_6010620e6751f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469136/normal_60581d900e516.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/8139113.pdfIn PDF document text
    • https://ranetaxute.weebly.com/uploads/1/3/4/8/134886021/929c27cb.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/QHkjgjd/epic_battle_simulator_2_download_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/3Fjcgio/download_deer_hunter_2018_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475204/normal_5fdc78e2ec4e3.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/funaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=strymon%20lex%20usedPDF link annotation
    • 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 5032 bytes
SHA-256: 42459fcdee1eafe2c7da8c6b99774e5f9f3eec9b8b329b661dc5f05c45bde283
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 8268 bytes
SHA-256: b6b5b14c1ac0ed9293a58a14b9debfd0e7822e79df41a4b456c57af4426ead65
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 11724 bytes
SHA-256: c1eccfd6d14a86619055bbf02d112e85a2c671162c48b5973c1dff64325241f5