Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fd7b12db333c11…

MALICIOUS

PDF

77.1 KB Created: 2021-02-27 23:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e709ce3703b6dc9d87fa95a3f2ad2e8e SHA-1: 6f609adf5ac98cfb8b85994726a93f78c4a71e08 SHA-256: b5fd7b12db333c11e89c157bfe92a6603ea49cff86c42b079f1036c830673f84
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious lure.

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://seumenha.ru/aws?utm_term=nail+salon+open+at+8am+chicago PDF link annotation
    • http://faceskinagainbeauty.xyz/is_48_laws_of_power_worth_reading9wndi.pdfIn PDF document text
    • http://natiral.space/zenonia_5_unlimited_stats_and_zen_apk41x3d.pdfIn PDF document text
    • http://konanozopesan.22web.org/nutritional_ergogenic_aids.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/duraflame_infrared_stove_heater_with_remote_control.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/985482065.pdfIn PDF document text
    • http://axecheat8.xyz/sidinorimefapixuwp6vhv.pdfIn PDF document text
    • http://tokio-2020.fun/letter_a_phonics_worksheetztano.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/luzugo3seo7.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/xevejopetetifizojabemidem.pdfIn PDF document text
    • http://iranomics.com/wejitapuduvekarokepes4axjj.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/xodirudofarobetarasume5xi7g.pdfIn PDF document text
    • http://sikuwolawotoja.22web.org/xowulibozu.pdfIn PDF document text
    • http://sodalabs.pro/46413376142lhg54.pdfIn PDF document text
    • http://naturalgood.space/meyer_e47_plow_manualiicbo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapejufujol.epizy.com/aamc_practice_test_1_answers.pdfIn PDF document text
    • http://gusubozavagu.epizy.com/ap_grama_sachivalayam_digital_assistant_answer_key.pdfIn PDF document text
    • http://wamilexujiweni.epizy.com/celtx_for_mac_free.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_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 5412 bytes
SHA-256: 878218e9276f7cf1f69236d300428015e4b6f46719f652c99659b5f5c4ff469c
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 10816 bytes
SHA-256: c8a4ca53102c21eb72cd963f98d3224ab97819ce441b7bad14d8c4868f4b379d

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