Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b4b1fc7d46f953…

MALICIOUS

PDF

75.4 KB Created: 2021-04-12 16:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8292e139038620a024bcf1b55d16c9db SHA-1: 2242fe2d82140d3d3ed611866695725c4adce2db SHA-256: 41b4b1fc7d46f953cd95cc5494c185d17f17c839d359d6b7334f10bf2f3920cd
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, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=is+there+a+filter+in+my+ge+profile+dishwasher PDF link annotation
    • http://greenbike.shop/open_automation_software7rrrh.pdfIn PDF document text
    • http://claire-irk.ru/visual_thinking_strategies_picturesebgoa.pdfIn PDF document text
    • https://fagadixiridare.weebly.com/uploads/1/3/5/3/135304990/pijezat.pdfIn PDF document text
    • http://mmuuue.space/ufc_fight_last_night_israelqi5uu.pdfIn PDF document text
    • https://fipokotosa.weebly.com/uploads/1/3/4/5/134506619/282793.pdfIn PDF document text
    • http://wukuname.mypressonline.com/17183478832.pdfIn PDF document text
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/bipopen.pdfIn PDF document text
    • http://dobilarujokux.sportsontheweb.net/48442926420.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/cluster_type_headache_adalah.pdfIn PDF document text
    • https://rarezeromodon.weebly.com/uploads/1/3/0/8/130874170/xegefov_nulovopinedipa_kubibufefodoxis.pdfIn PDF document text
    • http://sunny-web.ru/lexus_es300_engine_swap950gc.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/lit_romance_fiction_books_for_adultso36to.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sigobija/formic_acid_salt_nmr.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_02f8a86a24aa4e9c9f46b59d58cb6470.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pobixedele/tugideses.pdfIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_aab4d6195b7f4d7abd4abfa725744c68.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_95d96955612d4bcfbc574443a01e4fd1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miledu/59880223436.pdfIn PDF document text
    • http://sojusenetuki.onlinewebshop.net/51195247957.pdfIn PDF document text
    • http://bojepudadadax.atwebpages.com/vemidodejojapidosa.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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 5588 bytes
SHA-256: 9351b94c51f8dab0e1e602198e06e700fb02b776d2f65a923176e997ca9c3ca5
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 10900 bytes
SHA-256: cfb03afea504f7724cc8a5329c550e20a40fb6b169fc9fcc937d379062f14b74

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