Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec139db25d2a5f1c…

MALICIOUS

PDF

75.1 KB Created: 2021-01-12 17:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3d8ae2cf2dc6812e93acc527bb36c5be SHA-1: a3fb2e45466089b6771fae38790fb69ebb95bfd6 SHA-256: ec139db25d2a5f1c19ac4b07711cec956f8a394bc1ad37fe88ca61ef0bbf08c4
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to known malicious redirectors or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was heavily obfuscated, but the URL analysis is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://traffmen.ru/aws?utm_term=carl+jung+shadow+work+pdf In PDF document text
    • https://site-1177290.mozfiles.com/files/1177290/zunonoxofojokumanabofi.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/jUhcKjh/download_grand_stickman_cover_v.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/JT84qhg/89209310623.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/NAxjchi/transfert_credit_orange_pays.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/6208632.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/EDicXge/qlone_3d_scanning_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/gifibhd/82761091666.pdfIn PDF document text
    • https://site-1167963.mozfiles.com/files/1167963/kindergarten_learning_school.pdfIn PDF document text
    • https://niresofet.weebly.com/uploads/1/3/2/6/132682193/1648511.pdfIn PDF document text
    • https://site-1173985.mozfiles.com/files/1173985/dinosaur_simulator_dino_world_hack.pdfIn PDF document text
    • https://site-1166603.mozfiles.com/files/1166603/road_draw_climb_your_own_hills.pdfIn PDF document text
    • https://site-1168038.mozfiles.com/files/1168038/wevodetujuzadifipin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mupuraregonu/reruzolulakubizivuraj.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/biology_practical_book_for_class_11_cbse.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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 5440 bytes
SHA-256: 72817d907670952e5625ff74a0d6a5afb6b383e160c96a1b409ad5af5cbd062d
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 11176 bytes
SHA-256: 9657ca1def4b8f41ae9904898e6f51ce5bea7513cbbd8320b43831e7390e2a6e

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