Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6d015de33fb08e…

MALICIOUS

PDF

81.5 KB Created: 2021-06-06 11:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f9421407f996f9e6886dcd4bdaed8fa SHA-1: 9730870bcdddb9f49c56d55dfc0e680c39a911d3 SHA-256: ff6d015de33fb08ec4d522e261201f1c714bef30aebb105a6f9da09b4f8c5b2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to other PDF documents hosted on various platforms, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://static.s123-cdn-static.com/uploads/4385038/normal_60010d2d8ea74.pdf
    • https://xojenupikubola.weebly.com/uploads/1/3/4/7/134747345/baderun_jotipazixexe_desosesoro.pdf
    • https://sesupukaxupasi.weebly.com/uploads/1/3/1/0/131070911/sigakifo-sekaxamimizajin-nobazejazo-zuxujijefoz.pdf
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/jutudela.pdf
    • https://static.s123-cdn-static.com/uploads/4483870/normal_60093f547b03b.pdf
    • https://xesawamerubipox.weebly.com/uploads/1/3/4/6/134629950/3786318.pdf
    • https://jumaredutidab.weebly.com/uploads/1/3/4/3/134310232/4572774.pdf
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/busogubegifozopafu.pdf
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/8940106.pdf
    • https://bikirufiw.weebly.com/uploads/1/3/1/4/131452989/lanamozupe.pdf
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/bopafinuzogu-dukutatixub.pdf
    • https://cdn-cms.f-static.net/uploads/4372972/normal_604cdccdd432d.pdf
    • https://xuzipitazejaj.weebly.com/uploads/1/3/4/7/134722028/nolifunowotugu_jirelubigut.pdf
    • https://cdn-cms.f-static.net/uploads/4492286/normal_6060c3be65fc8.pdf
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/lasufewusifedama.pdf
    • https://koxufujemugipad.weebly.com/uploads/1/3/0/7/130739729/xerigut-kerefadoluv-gonixe-kozovexi.pdf
    • https://japafapu.weebly.com/uploads/1/3/1/4/131437770/2422886.pdf
    • https://midezotadodagof.weebly.com/uploads/1/3/5/3/135326840/1076251.pdf
    • https://static.s123-cdn-static.com/uploads/4407788/normal_5fe0fd71b7162.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=goodwill%20drop%20off%20box%20locations%20near%20me
    • https://uploads.strikinglycdn.com/files/9d5b8efd-3f90-4634-834b-5843de4e3b8c/traductor_de_espaol_a_ingles_y_pronunciacion_escrita.pdf
    • https://uploads.strikinglycdn.com/files/3627a822-e4ad-4523-83ea-0581d98a4c6b/finding_missing_angles_worksheet_6th_grade.pdf
    • https://uploads.strikinglycdn.com/files/e59298df-5714-4bec-8c8a-957bbe79774c/85683708728.pdf
    • https://uploads.strikinglycdn.com/files/5095e2d5-945f-4871-9d1b-afe4e15e83c2/sebefuvadawikaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2dc.bin
d99ad9bc3b480af6dc98159a825751040694c12a1c62938a40fc8260fcd8d1d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 5420 bytes
font_01_sfnt_off00010542.bin
b4e79aa44665722fa53c92b3f2252bfbd5e74586c59cb5c37bbdbdd6eff94a1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 10968 bytes
font_02_sfnt_off00012a84.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A84 4324 bytes

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