Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ca6b6a4d61eef7…

MALICIOUS

PDF

77.5 KB Created: 2021-03-20 07:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b5373eb5bd9a0881400793ea77da4cd SHA-1: 341dd9d0781df2a737c06a8f505042e267b1f289 SHA-256: f8ca6b6a4d61eef7cd9cac2c1843957aee19440ad62535d75c5dc766f3040d4c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting it's designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/123?utm_term=best+wireless+bluetooth+for+android
    • http://stopnutristrike.ru/html_to_phpnflam.pdf
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/foliv-wenasagidakod.pdf
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/vubuwokagoge_fojuremizuru.pdf
    • http://winnerslm.space/world_of_darkness_supernatural_meritsyh0rl.pdf
    • http://pasoxegidameso.iblogger.org/2299818539.pdf
    • https://zamuwute.weebly.com/uploads/1/3/0/9/130969683/4660265.pdf
    • http://cookwellbakewell.com/spider_man_hologram_comic_book_valuese1z1.pdf
    • https://luseviji.weebly.com/uploads/1/3/5/2/135298280/854953.pdf
    • https://zopokobo.weebly.com/uploads/1/3/1/3/131383813/feminagisolumab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jojudodadanu.epizy.com/blob_io_mod_apk.pdf
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_d8027e684ca2474a95cda347eef5012e.pdf?index=true
    • http://nafaloputazesoj.rf.gd/aha_bls_card_template.pdf
    • https://s3.amazonaws.com/votuweroxigezog/sogijezomemiramopovefojub.pdf
    • http://zatojuwetowoj.rf.gd/mibala.pdf
    • https://s3.amazonaws.com/jipowumat/pretty_little_liars_series_1_trailer.pdf
    • http://tasodeporojunez.epizy.com/wajidureluxopamebadigom.pdf
    • https://s3.amazonaws.com/retisovojor/ahura_first_defender_user_manual.pdf
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_800241e89d594c1792ef3b063123c1ec.pdf?index=true
    • http://vexujul.rf.gd/how_a_bill_becomes_a_law_steps_worksheet.pdf
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_5bd453240c574bcc92ca5632fdafc182.pdf?index=true
    • https://s3.amazonaws.com/vofadoloves/1643819727.pdf
    • http://revulagolorer.epizy.com/sipapixofadanutos.pdf
    • http://fokafupu.rf.gd/gusadela.pdf
    • http://difavaxegugadu.epizy.com/46441813992.pdf
    • http://luxotenudiwuzu.rf.gd/punigamilisufiwugisope.pdf
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_494e190116614735a4853dd9eb8308eb.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f211.bin
ef272563f1c90eb61a3ad406dc9af425cc5d38ec8568f000f27f5a64937c1106		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 5276 bytes
font_01_sfnt_off0001040e.bin
ca79afee8f41a282dae18ceb0aa626df78692b9d88a2557f05a5571e035aba23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 10644 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.