Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a7154c95dc5a84…

MALICIOUS

PDF

74.5 KB Created: 2021-03-08 01:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6cfb001c4a54555ec37950afbc0a7275 SHA-1: b65c1f181515cd0b5f2399f7d8ed66cbc87f1f7f SHA-256: c4a7154c95dc5a84d9e38c211c857a4c6af0f7ec0cc3ffeac4d59d2fbee9a0e8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=theatre+of+the+oppressed+book PDF link annotation
    • https://pebuwopaduve.weebly.com/uploads/1/3/4/8/134853156/9d4e62de559bd.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/harry_potter_y_la_orden_del_fenix_audiolibro_latino.pdfIn PDF document text
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/ef0c55116.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/4435116.pdfIn PDF document text
    • https://peletawipimo.weebly.com/uploads/1/3/4/4/134444154/vakoxigoduj-xuberalasolikun.pdfIn PDF document text
    • http://bonboxstudio.com/1981989041swnaf.pdfIn PDF document text
    • https://matigolexa.weebly.com/uploads/1/3/2/6/132682665/lotiraw_dalimalavoxaz_lubonunava.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/103637798aa.pdfIn PDF document text
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/21995f15.pdfIn PDF document text
    • https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/waxogus_muzanibonoke.pdfIn PDF document text
    • https://zodurulamenuvud.weebly.com/uploads/1/3/5/9/135956643/kurenitamit-nibovuwibiro-zijuvapebuvad-lujizitede.pdfIn PDF document text
    • http://hotloveme.online/ronco_ready_grill_cookbookpbekz.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/857e0893fc72.pdfIn PDF document text
    • https://gagodizuw.weebly.com/uploads/1/3/5/9/135965264/4190688.pdfIn PDF document text
    • http://kino-vezde.ru/entrepreneurship_test_questions_and_answers05sgr.pdfIn PDF document text
    • http://mamajan.space/luzor7kzz5.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/what_was_the_1987_stock_market_crash.pdfIn PDF document text
    • http://stixlife.info/woramajomepojanm2ru.pdfIn PDF document text
    • https://zafewogi.weebly.com/uploads/1/3/1/4/131407253/rovuvugejaguza_rovivunipog_gurebixewemo_budusozexanubi.pdfIn PDF document text
    • https://kolofajek.weebly.com/uploads/1/3/0/9/130969684/343e284e.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/how_to_prepare_for_cultural_interview.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/45cbf088-eab1-4449-91d7-10e2977fd5c7/83479548257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c658aec3-e374-4979-897b-7134a52d70df/40625357004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c794586f-dfd3-49dd-b706-f05c90adbc6e/70690003300.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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 5248 bytes
SHA-256: e2a22ad6721e05b8c532c288f862a8416deeac464a117d4b5be747fce9d1c15b
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 10552 bytes
SHA-256: 72347a2f466392e2cfd98e34adac6d219c6bd8c94337b6c33e66dad5eda21127