Malicious PDF — malware analysis report

Static analysis result for SHA-256 254e826a19e08a65…

MALICIOUS

PDF

118.1 KB Created: 2021-04-07 01:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3d189bcce8bb0ef129f7c5aafe622643 SHA-1: a8d80671019c943fc7b0a43c319a52284526a354 SHA-256: 254e826a19e08a65c41d237fca4d7985d6b961e63baeeedd078104a371bf13fd
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs implies an attempt to redirect the user to potentially harmful content.

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://ponafet.ru/award?keyword=alt+codes+pdf PDF link annotation
    • http://nudistoff.club/booklet_template_illustratorh8p3a.pdfIn PDF document text
    • http://instahelpforbusiness.com/exercice_ce1_adjectif_qualificatifgpgrk.pdfIn PDF document text
    • http://hamsterbig.com/32417488268yd1lf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_6007bddf6b6ca.pdfIn PDF document text
    • https://meximikilub.weebly.com/uploads/1/3/1/4/131406557/afaf8.pdfIn PDF document text
    • http://idealicait.website/9468721030w9dno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_6017042b7f36b.pdfIn PDF document text
    • http://guitar.su/pubavaxowipua4o6x.pdfIn PDF document text
    • http://salleapp.xyz/18146468269pbkea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_605158d6d9d94.pdfIn PDF document text
    • http://yildirimotobursa.com/205499488511uvv5.pdfIn PDF document text
    • https://bopisigo.weebly.com/uploads/1/3/1/4/131453919/doxinigelijat-mavisexotanusut-vitajafod-jugeset.pdfIn PDF document text
    • https://jejedutetobi.weebly.com/uploads/1/3/4/6/134662716/4aadd32c864.pdfIn PDF document text
    • http://babysampler.com/gapufunujezirunidojabobgyfz1.pdfIn PDF document text
    • https://pofofeteb.weebly.com/uploads/1/3/2/6/132681268/lafog.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/69763864-ea59-4416-a23d-b8124d2adad4/41466922261.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_6da0a442157e45d191507d7ad79df44e.pdf?index=trueIn PDF document text
    • https://6549db4a-2265-4a40-b67a-eae3a26d05ed.filesusr.com/ugd/55f640_18c5a6d7445a4e75bbe05b58a8fca6a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bfc3218-9603-4ffd-bcc5-b2b05557e01d/domav.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_030fd4ce7c374e5d85a273baa81b9f8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8599b38-4c4c-4f09-a9c2-ae1c7e1e6046/maxunejoda.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_7c3db027bbc14dafaeee77f9fa01c0cc.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001ac83.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AC83 13648 bytes
SHA-256: 9ee13403baaaf7da4a5ba110132d236dd165517c81c2d47ad996be982683fa06
font_00_sfnt_off0001379e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379E 4832 bytes
SHA-256: cf1a755a4a7036eeb285f8512841b7127f56fb6400e2a03b3f5508366e3242a0
font_01_sfnt_off0001482a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1482A 38264 bytes
SHA-256: 86a8f6bad9ba244646ced1932ec155f31f99af344fb79c7e3fae4dfa9ee31311