Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f2fa927cff8e9c…

MALICIOUS

PDF

112.8 KB Created: 2021-05-29 02:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a4a0122fb93478f8bfd1d038f8d5e56 SHA-1: e526caa1e9778a7cdff13e97b051f40424947cb1 SHA-256: 87f2fa927cff8e9c5172e83b260d32c0d9e489262e9277366899ac3029f79252
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on platforms like Weebly and Strikingly. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the structure suggests an attempt to manipulate search engine results or redirect users to malicious sites.

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://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/wuzorowogodu.pdf
    • https://cdn-cms.f-static.net/uploads/4483587/normal_6062caa3dbcc2.pdf
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5fe10d2f79ccc.pdf
    • https://static.s123-cdn-static-d.com/uploads/4403674/normal_60afe650b4572.pdf
    • https://cdn-cms.f-static.net/uploads/4413564/normal_601f549b7a4f7.pdf
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/wukamoxoxenatunajuwa.pdf
    • https://nubawobadeg.weebly.com/uploads/1/3/4/1/134131997/binogag-loloreponix-selifolelotel.pdf
    • https://wesudami.weebly.com/uploads/1/3/4/8/134881188/lalapusotasejujo.pdf
    • https://nagofojog.weebly.com/uploads/1/3/4/5/134586362/vosama.pdf
    • https://cdn-cms.f-static.net/uploads/4474734/normal_60461c1c69a10.pdf
    • https://static.s123-cdn-static.com/uploads/4496146/normal_5fecf6acb8c6d.pdf
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5fe3022e5c6f6.pdf
    • https://jelozenodi.weebly.com/uploads/1/3/0/7/130739120/woxidas.pdf
    • https://nopirepogoduk.weebly.com/uploads/1/3/4/0/134095858/kiwegelal_naxow.pdf
    • https://cdn-cms.f-static.net/uploads/4449630/normal_5fd369b3d287f.pdf
    • https://cdn-cms.f-static.net/uploads/4402507/normal_604b2ebdc63fb.pdf
    • https://sogegagep.weebly.com/uploads/1/3/4/6/134687839/bosuk.pdf
    • https://cdn-cms.f-static.net/uploads/4417815/normal_601744b36a23c.pdf
    • https://cdn-cms.f-static.net/uploads/4460473/normal_601ca1e7d3ccc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bQ3nTxENlgE/wb?keyword=organic%20chemistry%20reaction%20map%20pdf
    • https://uploads.strikinglycdn.com/files/28c8c7b4-c43e-465b-8567-867ed6a403e3/vizio_65_v_series_4k_hdr_smart_tv_specs.pdf
    • https://uploads.strikinglycdn.com/files/852a3c03-3576-4676-9b74-d9e1e2e130cd/sutawomededezepet.pdf
    • https://uploads.strikinglycdn.com/files/eabc13e1-117b-4f9e-b0a2-8f1547a4f6ae/cuanto_tarda_en_nacer_la_mariposa_monarca.pdf
    • https://uploads.strikinglycdn.com/files/23d1540d-6740-416a-b28b-74b48d2efd11/ocarina_of_time_master_quest_walkthrough_dodongos_cavern.pdf
    • https://uploads.strikinglycdn.com/files/c1fd3f14-0511-4e1c-89d5-dbff9c9ff243/what_does_825_mean_on_jewelry.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016482.bin
826bfc1fcee106d2735101ada6efb54423222e65d774087bce68b15728257448
pdf-font-stream PDF embedded font (sfnt) at offset 0x16482 5664 bytes
font_01_sfnt_off000177a7.bin
fd2686a22572133811ecc808f3304b2781f4e3bf4f53fcdaa373e9866760f287
pdf-font-stream PDF embedded font (sfnt) at offset 0x177A7 12956 bytes
font_02_sfnt_off0001a021.bin
d0de610a44833d9f92a20b335e1d6c69af6871dfa22bc37cc488cc0aef803e25
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A021 16184 bytes