Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33a434a1f883cc2…

MALICIOUS

PDF

79.9 KB Created: 2021-03-29 09:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12c278e39416ff38f7e22fbae337bfae SHA-1: 55ce826ab67e6e0c29d5198c0a791ce1885eab55 SHA-256: c33a434a1f883cc294250c7f075e9570e9df86ffc0936aca1e24b41f7d6f306a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=certificato+di+residenza+autocertificazione+pdf
    • https://fafogefefotal.weebly.com/uploads/1/3/5/3/135314601/1606230.pdf
    • https://vamabeloketofip.weebly.com/uploads/1/3/4/3/134344852/sadeni.pdf
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/pufowo.pdf
    • https://cdn-cms.f-static.net/uploads/4384642/normal_6017977d4dbbc.pdf
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5fdd3a9ac5a2f.pdf
    • https://kigodobegolalib.weebly.com/uploads/1/3/1/4/131453325/82595e85934dbd7.pdf
    • https://tenadugal.weebly.com/uploads/1/3/2/7/132740541/rotab_kezasufemutedi_lurujudufir_futepopo.pdf
    • https://kujunegisim.weebly.com/uploads/1/3/1/3/131380440/c30df35c756497.pdf
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/f91961.pdf
    • https://moduruwili.weebly.com/uploads/1/3/2/7/132710657/xenexu.pdf
    • https://laxukiwu.weebly.com/uploads/1/3/1/0/131070933/7298559.pdf
    • https://jalamipitifem.weebly.com/uploads/1/3/0/7/130738892/gulira.pdf
    • https://cdn-cms.f-static.net/uploads/4411916/normal_603f6378e0905.pdf
    • https://cdn-cms.f-static.net/uploads/4471474/normal_6027f97a62be0.pdf
    • https://static.s123-cdn-static.com/uploads/4490364/normal_6000611aa0c75.pdf
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/divuvif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d6f3bf85-9048-44b4-8323-0d54a1624ecd/aeron_vs_embody_vs_cosm.pdf
    • https://s3.amazonaws.com/bupaxomu/runasirelizafi.pdf
    • https://s3.amazonaws.com/sutawowirosuvuv/gazosa.pdf
    • https://uploads.strikinglycdn.com/files/fa191fcd-1ad2-417a-8a97-cd8151bbc590/kekoxu.pdf
    • https://s3.amazonaws.com/tobovunoberiki/rozotegoxudewakut.pdf
    • https://uploads.strikinglycdn.com/files/af0bca24-d63a-4c79-b097-68283fbe7a21/goldman_fristoe_test_of_articulation_3_manual.pdf
    • https://s3.amazonaws.com/tomaxade/40779178935.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_off0000ef1f.bin
3a10e4b8b8e4b8b0291cce64b4c19fef8e8299b175c12a978e2c15e4a814bb22
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 5072 bytes
font_01_sfnt_off0001006f.bin
352aa670bb7de7ade20f775c0ef0b5706d9b198103091b4be01a56ed268d846c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 10724 bytes
font_02_sfnt_off000123ca.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 4324 bytes