Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c8213e5996a0e8…

MALICIOUS

PDF

75.5 KB Created: 2021-02-20 04:16:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c878ac9bcab72bf938b3006d310d2cd7 SHA-1: ac6b125de9feb0b8f942edac9ad76b2ca2968da7 SHA-256: b9c8213e5996a0e8402dbb07b237fee319adacd6f9bddf177accf052ddc90cdf
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution. No scripts were extracted, but the document's structure and embedded URLs are sufficient evidence of its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=north+lomei+labyrinth+map+solution In PDF document text
    • https://xisezuvu.weebly.com/uploads/1/3/4/0/134096300/8568361.pdfIn PDF document text
    • http://gufutaca6.xyz/alhaji_sikiru_ayinde_barrister_songs_freeqbs4i.pdfIn PDF document text
    • http://homeolimp.com/busexewaiha4c.pdfIn PDF document text
    • https://cdn.sqhk.co/falupuvevore/hUiPwPt/amazon_battery_operated_window_candles_with_timer.pdfIn PDF document text
    • https://miwuzuxatidako.weebly.com/uploads/1/3/0/7/130775980/d897b26a.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/gMWjjrg/stickman_zombie_survival_3d_game.pdfIn PDF document text
    • http://gravkamen.ru/zinefokedajenizevosq2ro0.pdfIn PDF document text
    • http://ogranicbio.fun/dibrugarh_university_bsc_mathematics_major_syllabus9aqm2.pdfIn PDF document text
    • http://businesslinecenter.com/788814578418l00m.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/fmHvrij/street_of_rage_3_apk_download_for_android.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
    • https://s3.amazonaws.com/sugowubuf/tamil_movie_box_office_report_2019.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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 5152 bytes
SHA-256: 2aaae664dd423b5d7860a221c961de9f87f339039d47478fe59777f86b9894ec
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 9996 bytes
SHA-256: 1a6607fd6d2eb5f1674c266060212c21019394f709c2b88fc8bd6701cbbe54e1
font_02_sfnt_off000112d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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