Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bb0a7bd442107c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-14 15:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: edb748b5256c1ec949f7c75acdea6736 SHA-1: bef2613b7d23ab87567ed6b327ca98209c940d7a SHA-256: 19bb0a7bd442107c6b8c86fdfde351e8be039831bed63f46f6b1bf08fd77f613
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The embedded URLs and the document body, which contains garbled text but appears to reference PDF to image conversion, suggest a lure to a phishing or malware distribution site. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/award?keyword=chuy%25E1%25BB%2583n+%25C4%2591%25E1%25BB%2595i+pdf+sang+hinh+%25E1%25BA%25A3nh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476274/normal_60251aef7372f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_6024907fecbd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463279/normal_5fc8db6859270.pdfIn PDF document text
    • http://shopwithsale.website/mudupaxafasugajumugujapo0ti4k.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/021dfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496812/normal_5fce80cf1b27e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5fd05eb40c2b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_6043ec75a67e0.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/bijozum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_60267b738c33f.pdfIn PDF document text
    • http://ighelperscenter.com/nowudulewuxudodidaxotazeao62m.pdfIn PDF document text
    • https://fazerirusabutef.weebly.com/uploads/1/3/1/3/131381144/7881455.pdfIn PDF document text
    • http://pedron.fun/walmart_tv_black_friday_2019_ad8498t.pdfIn PDF document text
    • http://redita.fun/chitradurga_fort_guideiyql5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_5fe8f1e216905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_5fe6f7b040c62.pdfIn PDF document text
    • https://vesifumami.weebly.com/uploads/1/3/5/2/135294942/mijapabeles.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/3a15c9ba-71dd-4a85-afb7-7b7ce5ce8236/49171138340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b690c1df-163e-4260-ac6e-73b0d8ec4557/five_nights_at_freddys_3_song_1_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48790c79-5223-4143-aa26-100197afee6b/he_is_the_great_i_am_lyrics_gmwa_mass_choir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f3d808-2195-48d0-bf65-2aa6c1642230/lulaxesavijojapinufubig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3decc095-d3bf-4e53-8c67-073ae614f235/allen_carr_easy_way_to_stop_smoking_free_audiobook.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_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 6012 bytes
SHA-256: 966712bdc3eaabc66eb5d525e5d19435e6f28b8e942856885bb293a835608300
font_01_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 20856 bytes
SHA-256: d944b0386ba5206e0d79c70103f5beb894edb45c9457317aeeae73ca10f9b886