Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83cd6ddcac6aebd…

MALICIOUS

PDF

77.5 KB Created: 2021-06-07 04:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eaa4cd365dc7cdcf1dcaeb4ddbd5fc08 SHA-1: 11790390e65a7cdebcbe6dbb6b60b8163ba255b5 SHA-256: d83cd6ddcac6aebd3751ba9650bf3a41564de25a72a9eaaef63fcb2b0898f2a5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the sheer volume of external links suggests a potential for distributing further malicious content or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9529

Heuristics 5

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://inwebjor.ru/pbw?utm_term=example+abstract+qualitative+research+paper PDF link annotation
    • https://funiduned.weebly.com/uploads/1/3/4/7/134773133/kulovipu.pdfIn PDF document text
    • https://batuputuj.weebly.com/uploads/1/3/0/7/130739628/zuxil.pdfIn PDF document text
    • https://luwufanemalowix.weebly.com/uploads/1/3/4/6/134643085/binapetom.pdfIn PDF document text
    • https://biforowur.weebly.com/uploads/1/3/7/5/137513749/604722.pdfIn PDF document text
    • https://tanibegaw.weebly.com/uploads/1/3/4/6/134600132/4627770547.pdfIn PDF document text
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/7fb1b3819.pdfIn PDF document text
    • https://vopozurizezeta.weebly.com/uploads/1/3/4/0/134012331/c9c9c.pdfIn PDF document text
    • https://vuzozemipasu.weebly.com/uploads/1/3/6/0/136051601/nuzez.pdfIn PDF document text
    • https://xiwotedusogatif.weebly.com/uploads/1/3/0/7/130775269/wilabazuf.pdfIn PDF document text
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/retamu-xatokobonapim.pdfIn PDF document text
    • https://nimateson.weebly.com/uploads/1/3/4/8/134881528/giledej_katojofuxopuxi.pdfIn PDF document text
    • https://najoxoveg.weebly.com/uploads/1/3/4/6/134677255/6968752.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/sezej-vuzigaxorudeto-lujesojalimib.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/fa12df26-91b8-4bf3-9940-c2d5d62285c5/nubefisuvilexi.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144657579/avital_3100_programming_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d618781-604b-4021-8c13-34c4809178a6/el_sistema_mexicano_de_alimentos_equivalentes_libro.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144476448/balanceo_de_ecuaciones_por_el_metodo_algebraico_pasos.pdfIn PDF document text
    • http://zuguwar.pbworks.com/f/61855112569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8a1e3d-33f2-4999-aecb-fcfb2026d099/diccionario_frances_espaol_larousse_precio.pdfIn PDF document text
    • http://tezalef.pbworks.com/w/file/fetch/144551754/cuneiform_script_translator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ebe3554-e2bd-475d-96ac-5150d5577240/75708535214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b49251-3ada-49da-a681-e98622b71548/41242128898.pdfIn 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_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 5524 bytes
SHA-256: 67d1fcc8902079499914f37dea26aa1375d2c8f09fd21f37e26c5dcedbdf21c8
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 11272 bytes
SHA-256: 5ec813c9801ff55decfed694e806c4cb70887c0adff34cb0988f98d55d94f162

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