Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff52b2e43826b7d8…

MALICIOUS

PDF

75.8 KB Created: 2021-05-15 16:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: be396c6a99a11d1f34610d5ec1b38cda SHA-1: 8f9bc09bb125b79354a7bb0437c20e7cac98e0fb SHA-256: ff52b2e43826b7d839a8aa090e75a1e5f4bbb733eefe8f8b4b6c2e48feb7572e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL, 'https://seumenha.ru/strik?utm_term=what+does+605+mean+in+angel+signs', indicates a lure related to search queries. No scripts were extracted, but the PDF structure and link farm behavior are indicative of malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/strik?utm_term=what+does+605+mean+in+angel+signs PDF link annotation
    • https://cdn.sqhk.co/zasokolof/NiaTdoo/89523300981.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/RH9bjjP/1st_grade_worksheets_for_reading.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/iejdjij/popeyes_how_to_draw_cartoons.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/5u7rNih/58638020301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_6061e80e5b15f.pdfIn PDF document text
    • https://cdn.sqhk.co/wijugilom/jgOLih0/base64_image_to_php.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475382/normal_5fe52c2a8a1d3.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/Yq7hcif/ringtones_tamil_devotional_songs_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/s84ggjh/divofizavirosedugirizoni.pdfIn PDF document text
    • https://mavabebuvaxar.weebly.com/uploads/1/3/0/8/130814237/kojamosawugovozob.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/chc2ibC/41526921546.pdfIn PDF document text
    • https://sebikiwar.weebly.com/uploads/1/3/5/9/135962157/9108560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_601ae88b7d116.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/5ghXcFC/superhero_war_premiere_robot_fight_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/godivago/GhhDKo3/united_reformed_church_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/giLdicV/51261348824.pdfIn PDF document text
    • https://dipibuwedaji.weebly.com/uploads/1/3/5/2/135293441/borudefasidedan_xovodos_tiruzexif_namojanex.pdfIn PDF document text
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/3663193.pdfIn PDF document text
    • https://cdn.sqhk.co/tozerutiwezu/bhiDBJN/gamecube_smash_bros_melee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ba1606-1bfd-491b-839e-cd8d78536a12/rumizawaxupul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6eb500-7a34-4387-90ce-6c4a43e8e781/do_wireless_mice_use_batteries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543fa8ff-626c-458d-bf29-4e0bc2d098e0/how_to_be_a_hospital_receptionist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab6109a5-224b-4cbe-b9a5-2888dda07db6/62222601595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf153428-e47e-4270-a390-64c75a37b0da/depif.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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 5576 bytes
SHA-256: cb54e9f9987352cb59f965c73c312029afc3d699d657d9a9469064812d3a542b
font_01_sfnt_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 10252 bytes
SHA-256: b719888c73b38011768cc3f3e7818daa29adbbf5c550199a184a12f1ae40a431

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