Malicious PDF — malware analysis report

Static analysis result for SHA-256 767912a94336d513…

MALICIOUS

PDF

81.3 KB Created: 2021-06-03 05:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5d2ff63aa75df270e5bcfd7024d4b875 SHA-1: c879ebd1270dff83ffd3c822a296f66c17847b48 SHA-256: 767912a94336d513bc8e0aabbca1d7ff2c534f8edf0e2aac5694bed59019fccf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious or deceptive content, possibly exploiting vulnerabilities or leading to further infection stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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://pistant.ru/pbw?utm_term=what+does+flashing+blue+light+on+dyson+v7+mean PDF link annotation
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/tokizofelikatuviroz.pdfIn PDF document text
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/d4b543.pdfIn PDF document text
    • https://jujamepusa.weebly.com/uploads/1/3/2/8/132815903/4ba439cbd3145.pdfIn PDF document text
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/3f331aa.pdfIn PDF document text
    • https://lukidamovepuk.weebly.com/uploads/1/3/1/4/131437538/posowimoxan_lunewezifu_mupitujirejizev_lutabedusulo.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/941fd2a8ed23.pdfIn PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/dudaj_dufadupebapif_buramivinu.pdfIn PDF document text
    • https://pagomowe.weebly.com/uploads/1/3/4/6/134608852/54e991b.pdfIn PDF document text
    • https://saremugofu.weebly.com/uploads/1/3/4/0/134017097/b5b38d.pdfIn PDF document text
    • https://desofaris.weebly.com/uploads/1/3/4/6/134612921/5957803.pdfIn PDF document text
    • https://popewike.weebly.com/uploads/1/3/1/4/131407195/jupebetof_novadutima_kikedifuvoz.pdfIn PDF document text
    • https://wagezulixi.weebly.com/uploads/1/3/2/6/132695300/731535.pdfIn PDF document text
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/371ae1b4a.pdfIn PDF document text
    • https://wirumexazejop.weebly.com/uploads/1/3/4/5/134599385/571197e56056.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/999ab54b-8df6-4e9e-bf87-0d873bf25e33/five_dysfunctions_of_a_team_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af8b89c-e612-4f4b-af81-ddf9e04cf2e2/wuxubozupinexepazokoni.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/download_film_teman_tapi_menikah_2_layarkaca21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c8c531-0a5d-4025-ba46-20b777c7ae2f/juligivuxiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a59f4a-b1ac-4f89-b480-a8fc78cbf797/garmin_vivofit_jr_2_bands_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a96c72-40d4-496f-8f65-5658df32dda3/pentair_easy_touch_control_board_manual.pdfIn PDF document text
    • http://litorabi.pbworks.com/f/wutagulexubaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0669c7-ccc8-4f36-9fce-7c57ecee9083/62945800386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6903c97-7532-45e5-92bc-92bb96111bb3/technics_sl_1500_turntable_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfe3c28-4352-48c6-8e81-04e1542ae8d8/what_are_typical_behavioral_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90600fc2-b20e-4a1a-9f7e-e1618fde413e/78646768349.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/33215753141.pdfIn PDF document text
    • http://damopijos.pbworks.com/w/file/fetch/144498510/97477431300.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_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 5620 bytes
SHA-256: 303c1ca3727d19571135583401073793679d56bff2fcb701915ba0187f480701
font_01_sfnt_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 10796 bytes
SHA-256: 67a0c23034e557d71a9211dd2058fe998b0f04d9cacb2fc293505c2c0210bb9a

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