Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b8e1bf3138f6f2…

MALICIOUS

PDF

71.5 KB Created: 2021-04-01 15:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 94ba6ca2718b694a0556e821b0c84acf SHA-1: 58cd0d98374a816eec6cdf977c654243e7ac41b6 SHA-256: 71b8e1bf3138f6f246e7d5cdebc5731abbc6c9549de9ead733fe4c413921889a
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 pointing to disposable hosting, indicating a link farm designed to drive traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=adding+integers+worksheet+grade+7+pdf PDF link annotation
    • https://cdn.sqhk.co/lasijutag/hbEOzMn/does_mario_kart_7_use_amiibo.pdfIn PDF document text
    • http://copyright-central-media.com/wewopukfco32.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/4qvS2zu/tavapidipevizofubipido.pdfIn PDF document text
    • http://astropsychology.website/nokozasezgifew.pdfIn PDF document text
    • http://iranianvc.com/bose_qc15_battery_cover3crf4.pdfIn PDF document text
    • https://cdn.sqhk.co/menekilebuz/sxicuid/mezuvokiba.pdfIn PDF document text
    • http://bixazagurimu.iblogger.org/12108961159.pdfIn PDF document text
    • https://cdn.sqhk.co/tudifemumopi/BibmjdY/90545565612.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/ea74bc0d-6c0a-426b-ab60-7519ed3ac20f/how_to_breed_moina.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_35aed2c11c85421b8024c0c37653e7fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df96e2c-9988-4d86-a9dc-9d04d9ec2231/the_fallout_book_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/856e1c32-d4ab-49d0-9829-8af96f23088a/86066211723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0238a4a8-e77a-45a9-b861-6c34a6040ebc/86628439488.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_cf4e1c2442904e53b43efa3e50654497.pdf?index=trueIn PDF document text
    • http://zubuzonaf.rf.gd/biwixo.pdfIn PDF document text
    • http://nazifaba.rf.gd/tipos_de_acoso_escolar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4520ca86-ebd2-489d-80fd-1852c11e8d7f/we_are_going_on_a_bear_hunt_book_cover.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_e94e268d46664209abe69d8ae84ea885.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27711f7-81c6-4290-ba2b-a2904d790d4a/73063116092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8db78d-6ab9-4ae6-baea-31723a1debee/alfred_hitchcock_the_birds_movie_trailer.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_c0a7376779be412d9c3d7aca1fba20d3.pdf?index=trueIn PDF document text
    • http://nixitomo.rf.gd/application_letter_sample_in_nigeria.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_39b91f2504d5490793f9a857622c4d0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/401f4329-df65-4047-bf74-d3e4962518bc/is_kirito_and_asuna_still_together.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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 5496 bytes
SHA-256: 6bbb73920ac6cc14d9642fe8e686f5a5ba96df2e359944c2ecf76aead4650285
font_01_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 11336 bytes
SHA-256: 6e77fddc6fe3eaaa2adb73c5cae645fb1308ac1e43912e1c0d8a1331c6e0da74

Open this report in the interactive analyzer, or submit your own file for analysis.