Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c955c473dbcda4…

MALICIOUS

PDF

78.9 KB Created: 2021-05-02 07:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 90781b0156b9e4662a2df01c93e9def6 SHA-1: d27430819ea82922ae4140620b9345f767a38e76 SHA-256: 43c955c473dbcda416607e63c7a6b4e6b197a6bb08f1a1bf67faed2d8b36c339
186 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm intended to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external links and the overall heuristic firings indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/strik?utm_term=which+timex+ironman+is+the+best PDF link annotation
    • https://cdn.sqhk.co/zadexona/6wlrRjd/42407361235.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/gdOlijQ/the_impossible_quiz_book_chapter_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vopokemib/Ybhfgh1/folos.pdfIn PDF document text
    • https://cdn.sqhk.co/pibigovaxavu/jdSifBp/cod_loin_recipes_baked.pdfIn PDF document text
    • https://cdn.sqhk.co/laxegipo/giu2ghU/jonukufolit.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/Gjeorhc/62714147065.pdfIn PDF document text
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/fuzovovaz_samamavawadug_lenororaba_raxaxezugaz.pdfIn PDF document text
    • https://loxazubak.weebly.com/uploads/1/3/0/7/130739809/zemegil_fuxabajaxoder.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/9680752.pdfIn PDF document text
    • https://cdn.sqhk.co/rapekerokemo/ijrdhau/48437178769.pdfIn PDF document text
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/gobajibowowim-wirodid-bukozak-pubedimox.pdfIn PDF document text
    • https://cdn.sqhk.co/daxozazon/5yuPjgT/56966658268.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_5df33ad1c3014cb480a479f5fec7d9dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8acf71e-71a2-4b8b-9a51-bead9e14238b/mazokonununedane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858a5eb9-1208-4d21-9a98-3c5c25688b7c/will_there_be_another_little_fires_everywhere.pdfIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_b1e711854c504d769a279a3c39cbb74d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6537e6f2-14fd-431c-9ec9-b3259cde4405/40688128303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cfe0e0-0d50-449e-a3f9-04f989ef092e/how_to_get_scratch_app.pdfIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_0839df4364c54e9b93b2321c95301d37.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_0ee71fc2e4fc4aa9ade0bbeb90d9f395.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c189ecb-9e26-400d-9d1e-bca547952ce5/landice_l7_treadmill_with_pro_sports_control_panel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1aa478-b429-4f24-9fca-113872e17ab0/english_learning_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563b286b-d5f5-43b8-bfde-bb212c20ab8e/emerson_nature_essay.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_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 5228 bytes
SHA-256: a8433a895e5c092d2b98898535af9e6beb48dded221987565590074d2e049b06
font_01_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 11092 bytes
SHA-256: 7cc359d70ae849191b0ff4032aff6658e9b4bb1dd7e6f33a06cd5e95e706a34a

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