Malicious PDF — malware analysis report

Static analysis result for SHA-256 534d2961906f0c26…

MALICIOUS

PDF

112.3 KB Created: 2021-03-22 18:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6d9e62703f359d95d24f16df8d1af2a3 SHA-1: 58bf9c9cfdfff4c2d3412f1691f7e575a9928163 SHA-256: 534d2961906f0c2620cc800134b04fde67268b7820faf18811ad6eb145750d40
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains numerous external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zajinet.ru/wix?keyword=codex+magica+pdf+espa%25C3%25B1ol PDF link annotation
    • http://myfoxing.online/dr_seuss_stories_listu2ga3.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/hh8jiIP/21362842664.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/5wifhaa/megan_fox_2020_dating.pdfIn PDF document text
    • http://firstdoctor.xyz/tip_top_health_shoppekudxa.pdfIn PDF document text
    • http://spainsale.pro/snake_vs_block_skins_50s1auy.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/2cl3Wn6/ruxuze.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/Zjjhiht/homes_for_sale_in_the_bahamas_islands.pdfIn PDF document text
    • https://cdn.sqhk.co/fatepotax/dighfje/orbot_tor_for_android_apk.pdfIn PDF document text
    • http://girlsbeach.space/40767140197835zk.pdfIn PDF document text
    • https://cdn.sqhk.co/belexewuwif/4rRbZhc/63752414599.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/what_is_the_workplace_culture2dt7y.pdfIn PDF document text
    • https://cdn.sqhk.co/pajubopolak/jgibigh/15967519768.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/jifgigi/brocato_s_sandwich_shop_tampa_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/ddgVEKl/throne_of_blood_movie_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/gcidgiy/poboy_depot_in_marrero.pdfIn PDF document text
    • http://firstreadersclub.com/figure_of_speech_irony_worksheets1vcck.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_ff16f37d6159498ba6e0ae0749aa30e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b6d9a7-e51c-44c3-853b-354208252aea/apa_descriptive_statistics_table_in_r.pdfIn PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_5e7bd47dff984dfcbaf6658250f8f579.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef107ed-9443-4c5a-9e6f-4bf70ebf01dd/96464443710.pdfIn PDF document text
    • https://9847beff-b4a9-463e-b9ea-50c12313086f.filesusr.com/ugd/87ad98_7bdf15d051654fc8a9f5fa61b97b70c9.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_d3dcb293b43f42e5b23ab913570c6f23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2643c97-fff5-44c4-bb62-b8ff7c67b82e/7250667195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baa4c458-733f-4c73-a62a-2ab93862704a/96642124803.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
    • 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_off000151a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A8 5284 bytes
SHA-256: 061c33316daaefaf99bd6ef1a5bc6750d5f98d7831e2d48b0406b82368ecd6c8
font_01_sfnt_off00016394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16394 13076 bytes
SHA-256: 36bd9f8cbcf3854c5160669e37639f30978c31ce8e507d1d6eb237848ad61456
font_02_sfnt_off00018e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E91 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c
font_03_sfnt_off0001a38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A38D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176