Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f5e5f17700b6ca…

MALICIOUS

PDF

71.8 KB Created: 2021-02-09 22:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 71baba2b3b321ea00ae9be84d88b6905 SHA-1: d414626c76785bbda0d0af0b02d391ed859ee99d SHA-256: 65f5e5f17700b6caeb28eef5e9a6eada4066ab7ad767ca68efe2029ad0e5d327
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://bologen.ru/aws?utm_term=haldia+petrochemicals+annual+report+2018', suggest a phishing or malware distribution attempt disguised as a report. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://bologen.ru/aws?utm_term=haldia+petrochemicals+annual+report+2018 PDF link annotation
    • http://albl.ru/rover_on_mars_live00va7.pdfIn PDF document text
    • http://mydenverneighborhoods.com/convention_aix_les_bains_maroc_france0t2dt.pdfIn PDF document text
    • http://jewlgems.com/safari_2020_price1zqjs.pdfIn PDF document text
    • https://giximanuv.weebly.com/uploads/1/3/4/5/134526051/wojutezasum.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/tamojuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381344/normal_5ff4d107b7246.pdfIn PDF document text
    • https://lefesime.weebly.com/uploads/1/3/4/8/134882546/wuxibifis.pdfIn PDF document text
    • http://berkeciftci.net/formula_rotacion_de_inventarios6w2v1.pdfIn PDF document text
    • http://idealicaitalia-official.site/stack_ball_2_mod_apk68xds.pdfIn PDF document text
    • http://zabumufunesomud.66ghz.com/hypertrophic_obstructive_cardiomyopathy_esc_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455670/normal_6008a3ef64455.pdfIn PDF document text
    • http://mukoxadetovewo.66ghz.com/vals_de_amelie_piano_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jojanotesejivi.epizy.com/40250561806.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/pair_bluetooth_headphones_with_sony_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/ibps_guide_october_current_affairs_2019.pdfIn PDF document text
    • http://rinaditinimi.epizy.com/kiwusobegefimariwusiji.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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 5792 bytes
SHA-256: da840e31b92ec135521c7f76bcc15e3eeaec48f0017e33e483dfbc8ccfcbe453
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 10772 bytes
SHA-256: cba2f93d7592044f7031df487f457c600137011a09454295dc7879d87376dc5b

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