Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdb57df54cbc691…

MALICIOUS

PDF

76.7 KB Created: 2021-03-20 06:20:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc696dd60934015a9ea4cef336384c88 SHA-1: 5be6c8d6dacd03c10733ca59895ae725a001e218 SHA-256: afdb57df54cbc69148cc576977948501e91cc767c0d037c19d0ef902e5f1e17a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 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://jacksth.ru/strik?utm_term=plantronics+voyager+pro+uc+b230-m PDF link annotation
    • http://warixedivukinat.mygamesonline.org/introduction_to_data_science_rafael_a._irizarry_solutions.pdfIn PDF document text
    • https://gujejedadun.weebly.com/uploads/1/3/1/3/131398181/e9298237cf.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/amar_asom_news_paper.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/1860057c46064.pdfIn PDF document text
    • https://pufoxufuzevelo.weebly.com/uploads/1/3/4/4/134486621/kujipusur-bixetevobiditaw.pdfIn PDF document text
    • http://triple-doska3.club/zefupetesajizum56s1u.pdfIn PDF document text
    • http://botanilix.mygamesonline.org/87080427619.pdfIn PDF document text
    • http://joblanc.xyz/46276086299v64xa.pdfIn PDF document text
    • http://kvyovk.xyz/chicago_bulls_red_uniform3yu7t.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/4091fd61-1ecb-4217-91d2-7fdc5e70eb8e/mufuroveguzovovubawuj.pdfIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_e4dcac9364cf4dd29450d487b5b43f7c.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_4d79522b72ce49f8b5b269c7e952ddd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/review_mediheal_sheet_mask.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/76378796767.pdfIn PDF document text
    • http://pupagerirawax.myartsonline.com/wedotosefevagoduviwozu.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/gakolafidorigevag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765b5048-a6f5-42c1-a35e-505ecc367409/en_una_tabla_periodica_cuantos_elementos_son_naturales.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/42061305946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855ce0a5-a940-4dc5-8ccb-ef3b085b5a08/kilapipi.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_62fc03db671346ba85671aea3f4744b4.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 6024 bytes
SHA-256: 32f465899038e1f47b3e7bc1feb8ba1ee18d1bca9b1c4fff256eaa5f6d9ea051
font_01_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 11472 bytes
SHA-256: 34af2a423e72b553908fcbf08798c87e2a77b1320807c75c9f5be45231d50fea

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