Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e503586d48d013…

MALICIOUS

PDF

77.9 KB Created: 2021-04-01 05:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 935202e504041ad0d9501633cda26861 SHA-1: 5309a5b6d8abdfc702875c96fe8423816ca044a5 SHA-256: b7e503586d48d0137130c202e825a93d403ffd7fab2e78234ea94d1fe5033cca
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a cloud-document share lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://golowaki.ru/wix?keyword=tubemate+apk+download+for+android+2.3.6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490263/normal_605bcab8220a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_6041177bdb2ff.pdfIn PDF document text
    • http://sowugadawalu.iblogger.org/apocalypse_world_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5ff6d327e2f79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484993/normal_5ff1ca723c302.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/allen_ginsberg_poem_howl_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5fcecc3056d27.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://andyhong.blog/tutunogetapioiwbv.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/siveputazogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_f0dcac67e6a34a8a8eb03ef1bcdc2c09.pdf?index=trueIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_8c082d97fdf04e328cffb62b8abc731c.pdf?index=trueIn PDF document text
    • http://wufijuwodep.epizy.com/fluvial_processes_and_landforms_ppt.pdfIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_df8814be923a49079173fe0038ff77d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d82e259-153b-434e-817e-2f2c2a8182d7/86115679416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff09a3ea-4914-4335-9064-7659f30cda58/dedowu.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_8279fc30894f4388a861ea7b0d92b4a7.pdf?index=trueIn PDF document text
    • http://nametelival.rf.gd/51938625638.pdfIn PDF document text
    • http://sufumawug.epizy.com/5591504149.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 5736 bytes
SHA-256: 1e6b4acb4b2040dd888499424f0efc79c73a07e846035baf80daa95b51028613
font_01_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 10500 bytes
SHA-256: 6fba8efc826d08f35197d71c4b1abf090be3baa27c390258745773e1f33bfc21

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