Malicious PDF — malware analysis report

Static analysis result for SHA-256 1882f84ccf7160f8…

MALICIOUS

PDF

81.5 KB Created: 2021-03-30 16:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 196b877b485f91169098e9a369af1713 SHA-1: efe1aaedb5659a12ce186b4375183b79fb88a3eb SHA-256: 1882f84ccf7160f8d89e7a15fba361f657b0443de008ff8140c2729c879cdbf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain text related to book series and software, likely serving as a 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://druttle.ru/strik?utm_term=what+is+the+order+of+the+beautiful+disaster+series PDF link annotation
    • https://cdn.sqhk.co/panazomuv/bZl3hdX/car_x_drift_racing_bonus_code_money.pdfIn PDF document text
    • http://logoped-samara.ru/1963992507038dwn.pdfIn PDF document text
    • http://sandiego-podcasts.com/assistant_pro_for_android_23._33_apk_downloadawd0m.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/RghBjcJ/the_girl_in_the_window_movie_trailer.pdfIn PDF document text
    • http://bukuxojunuz.mypressonline.com/rexroth_pneumatic_cylinder.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/a_night_to_remember_free_download.pdfIn PDF document text
    • http://soinjaga.ru/43969543252i2ny5.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/briefer_history_of_time.pdfIn PDF document text
    • http://azorocheat6.xyz/57229494510ti9u3.pdfIn PDF document text
    • http://vujenixuwo.mypressonline.com/search_site_for.pdfIn PDF document text
    • http://xixibef.22web.org/windows_10_pro_free_download_full_version_with_product_key.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/34695235598.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gowepuxajotezo.onlinewebshop.net/pdf_to_word_online_free_large_files.pdfIn PDF document text
    • http://tugujaxozulir.rf.gd/how_to_be_successful_in_your_twenties.pdfIn PDF document text
    • http://dalufiba.rf.gd/exercise_plan_for_weight_loss.pdfIn PDF document text
    • http://vububogux.epizy.com/wotilevexivuwufufob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 4924 bytes
SHA-256: 427f8822163c69b2a023b7b1acca193a27985713bd919971df56a00a9422c9da
font_01_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 11344 bytes
SHA-256: e0b980d78330ab6100650ea068ddfc6e81d5434b0e89a93e6f7647ca7d459add
font_02_sfnt_off00012aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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