Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eda59669dc2ddb4…

MALICIOUS

PDF

80.1 KB Created: 2021-02-04 14:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b9092d10c0f8e5c1730952c820d40b1d SHA-1: e207948e8d95b466f4359d4aa5d046416f14c2cf SHA-256: 7eda59669dc2ddb43eee4343da8f330d2ab16fb74b90b47b34d5218ec3a9db04
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wb?keyword=facebook%20cover%20template%20mobile PDF link annotation
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/576ab151.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/hjhatoh/blaze_monster_truck_halloween_costume.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/b4ac0f983c.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/7427472.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/WYtegNL/58498851164.pdfIn PDF document text
    • https://wuvalarovujed.weebly.com/uploads/1/3/4/2/134266489/sadafaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_600f52f45a263.pdfIn PDF document text
    • http://help-violation.com/construction_robot_factorioyimd0.pdfIn PDF document text
    • http://ital-girl.space/percy_jackson_and_the_stolen_chariotbiq7v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5fdfa9727a2fb.pdfIn PDF document text
    • http://dragonflysagewellness.com/your_wish_meaning_in_bengali1xdyy.pdfIn PDF document text
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/tepixudedesew_nibeto.pdfIn PDF document text
    • https://ruxunomitebapat.weebly.com/uploads/1/3/1/6/131606858/d1f4ab3c1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368952/normal_5fdfda4a957b2.pdfIn PDF document text
    • https://jitosagar.weebly.com/uploads/1/3/4/3/134318128/wimazevasul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_60122030a20dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490936/normal_6007e441bb4c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 5120 bytes
SHA-256: 7b992d7b665946a8ca2c4c772c2291e281a9d1442eb06aa66c4f8abcd69f4b67
font_01_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 2344 bytes
SHA-256: 3e6c323c9e67c04efddc5e9d761c360b2a452c22c2c4ae0ae2381f21a2f52bda
font_02_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 10800 bytes
SHA-256: 98c23594623661d6b1aeedbc352b84ed2c37ed3033527cc76ba91718de8d9e15
font_03_sfnt_off00011cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBB 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0