Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae41446bfb9323f6…

MALICIOUS

PDF

82.0 KB Created: 2021-03-20 21:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 86d792ecc4339cb7b89a9f868ced3101 SHA-1: ab1c2baa0378b02e85c921a04deae10ed85ccd7a SHA-256: ae41446bfb9323f6849bfc8bbfcb765eb78ee2aeef6c7fcb2de831b37a2045e3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=varicela+complicada+en+adultos+pdf PDF link annotation
    • http://nusamovepi.22web.org/65215978010.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifigazanovew.epizy.com/google_chrome_64_bit_offline_kuyhaa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2fce61d-8359-401b-9b19-16d35125f805/kesutizeneder.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_0e7121f604d94102aea5b1cd18279253.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/wemimuwuzutewumumosijeli.pdfIn PDF document text
    • http://molomafifivis.epizy.com/44674227090.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_66c210732e2546afaa6db797a496af6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/after_burner_climax_android.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_b06add08b2774f0ab3ee8eae429d55e5.pdf?index=trueIn PDF document text
    • http://fepavipa.epizy.com/maus_2_sparknotes.pdfIn PDF document text
    • http://gogufujupi.rf.gd/2164108576.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/bovagobejozajemixufoxaxom.pdfIn PDF document text
    • http://gamupuzif.epizy.com/50661567998.pdfIn PDF document text
    • https://bd09a4ac-0dd2-4533-a87c-7e18f90dd81b.filesusr.com/ugd/1b0481_00218166e9f0448b8a300e960cc99e4c.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_2afdcdd763a04862ac6c4185e4f642bc.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_98628cdde9e648f3aa198aaf76643ac1.pdf?index=trueIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_c352f632e5894f068e8b64d25f7f7f3c.pdf?index=trueIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_664e6af5d71f4e13b917e31ca9dfe7b4.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_1406e6f1938f4588808d590e9221df3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f924cd7-f8f4-4572-9c7e-bc4581ef2fbd/gabezufiponowobepanegiz.pdfIn PDF document text
    • http://katemuzi.rf.gd/46815163189.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_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 5264 bytes
SHA-256: 5224acca554113b2186e9f9a6de8cbf596e527cd945ae7e295561510417e37dd
font_01_sfnt_off000113b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 11496 bytes
SHA-256: 692a095a5f6d4ab8a631d536369d0bf6f7b047376035136109da3d0c15614fb1