Malicious PDF — malware analysis report

Static analysis result for SHA-256 002a1e7e4f0db657…

MALICIOUS

PDF

80.6 KB Created: 2021-04-01 11:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11d2184a99c2a5c9571254a51e8209df SHA-1: d4e0b3f87d480d512e4f502877f14feaeb18b728 SHA-256: 002a1e7e4f0db657b068a40db65f674bfa9f254e8c1ac35ae87301c343368b51
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature. The embedded URL 'https://seumenha.ru/award?keyword=the+caucasian+chalk+circle+analysis+pdf' suggests a lure to a phishing or malware distribution site, disguised as a document analysis. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://seumenha.ru/award?keyword=the+caucasian+chalk+circle+analysis+pdf
    • http://ionatr.space/excel_vba_loop_over_named_range3wyzx.pdf
    • http://farvestnn.ru/borosilicate_glass_sheet_nz4rpqu.pdf
    • http://claire-irk.ru/xojogimevovowivijenipezazcxg83.pdf
    • http://kutejovanog.getenjoyment.net/90414087995.pdf
    • http://naturfresh.fun/dorezelosebivwq68s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e667f071-ad74-4634-ba14-bb4238d83130/rejopozo.pdf
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_1878ebc8638b4e02a8504d84c7701bcd.pdf?index=true
    • https://s3.amazonaws.com/mujevubutukoxu/colliers_international_philippines_report.pdf
    • https://uploads.strikinglycdn.com/files/c392126a-fbbe-48c6-948f-84d4426ee23f/waring_professional_double_waffle_maker_manual.pdf
    • https://d1b6b380-f15b-462b-86b5-0b089ba7d90d.filesusr.com/ugd/f99a33_6fd5250cc0d24302b23fecbc9ee92421.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23c43f57-4ca3-4e74-9b60-e7c4784091cd/79487662190.pdf
    • http://taroveruwidiba.onlinewebshop.net/modern_calligraphy_alphabet.pdf
    • https://s3.amazonaws.com/wejuvono/arriva_trains_compensation_form.pdf
    • https://s3.amazonaws.com/wejuvono/do_silver_dapple_dachshunds_have_blue_eyes.pdf
    • https://s3.amazonaws.com/rizezobabub/best_stephen_king_book_covers.pdf
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_10c40baba24540e389815a6d053e9491.pdf?index=true
    • https://s3.amazonaws.com/pidufozu/lelakobigexu.pdf
    • https://s3.amazonaws.com/sefipa/47177366560.pdf
    • https://s3.amazonaws.com/rogugagatuf/latest_eclipse_for_selenium_webdriver.pdf
    • https://s3.amazonaws.com/fogibi/aashiqui_movie_songs_mp4.pdf
    • 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_off0000fe82.bin
42136bdd6f0be73806096cf426a6f00e3b6167ddb70f5e941966da267493b1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 5356 bytes
font_01_sfnt_off000110bf.bin
926e3580d593c6f07e6e7a729d5eb6044303c4856faf7dddf09a42448653ebef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 10500 bytes

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