Malicious PDF — malware analysis report

Static analysis result for SHA-256 28873775ec78bc48…

MALICIOUS

PDF

77.7 KB Created: 2021-03-07 11:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9ed4592281177831492d11f0b2de82c5 SHA-1: d327c58744b7e5b69374f7fa00c1295d738d4398 SHA-256: 28873775ec78bc487be05046800daae8053447b0f4a604d2089111b96050af2b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to unit conversion and application metadata, which may serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://nipisod.ru/strik?utm_term=16+pulgadas+cuantos+cms PDF link annotation
    • https://cdn.sqhk.co/bipuzojafa/Ydr5ifR/online_bill_check_punjab.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/eieicjh/nuzozuweje.pdfIn PDF document text
    • http://bepevekebezupu.22web.org/xozemokamejibuxuwuwo.pdfIn PDF document text
    • http://sukukotomi.22web.org/rugejas.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/dChigcO/savixerutuxiloxon.pdfIn PDF document text
    • http://xurekurise.iblogger.org/13227805144.pdfIn PDF document text
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/d99889.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/zVE2jgu/sovasigigilagurigupoto.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/RLidjgo/change_eye_color_photo_editor_android.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/2738288.pdfIn PDF document text
    • https://sevimuxeso.weebly.com/uploads/1/3/0/7/130739978/4922111.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/zixezuwum-tixewugupomem-pexasuxuxitok-bemusupul.pdfIn PDF document text
    • http://rilotelexewobos.iblogger.org/34650866500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_52ba397e926a4633a11edcb62868102d.pdf?index=trueIn PDF document text
    • http://nukuxora.epizy.com/paletemiwivolukugiguro.pdfIn PDF document text
    • http://fozusiraviwip.epizy.com/watibulunemo.pdfIn PDF document text
    • http://tituroxir.rf.gd/android_brute_force_password_cracker_apk.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_416df1fbc7a7427b80e709f9874030fd.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_1a67527dcfea49bc844cf8d82a10a102.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 5408 bytes
SHA-256: 1c876d01acd95c0bebebc364f2faf367110807e5631f4b333817725a1be5fc88
font_01_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 11756 bytes
SHA-256: fca82991b911cb65f1426e8ef7b7a593a9ec193ae63703116d808e1a102c2508
font_02_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 16100 bytes
SHA-256: e8be64a599b4775abf69106d1ea2a605297721d8ccc8071fb3d67c702b09cfa6

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