Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac78cc87e0fd42c…

MALICIOUS

PDF

56.9 KB Created: 2020-11-07 13:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: a2fbabf9316e88c7424c727b5783649d SHA-1: 6a3193b319b586d599d9c82b94b43022fbcd1c21 SHA-256: 8ac78cc87e0fd42c4529deb6e2d502a7889d1c5393cd03ac54bf719fa2f76bcb
144 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/aws?keyword=cdl+hazmat+audio+study+guide PDF link annotation
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/55cd9e8865.pdfIn PDF document text
    • https://nisewoji.weebly.com/uploads/1/3/4/2/134266574/zovinozafa_zefanojed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/279bb464-e02d-46f8-bacb-456b2f62acc7/28685804689.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/local_news_hot_springs_ar.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/20363529324.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/mitochondrial_eve_mt.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/king_of_thorn_anime_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00ad37e8-3e00-44c7-8c37-937e1790f27b/49974140676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac509bb-61db-4a99-a1f4-bfe9d4442e68/70320230280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b4af39-b897-45fc-9bcf-8464e2d62739/escort_passport_s55_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c72b58e-b8d2-4e13-81bc-cc1dc391f87b/electrical_machines_drives_and_power_systems_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05b235c-8082-4b9a-927b-f9119dd908a8/defiance_weapons_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/columbia_st_marys_milwaukee_medical_records.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D82 11344 bytes
SHA-256: 6969fb9c339f4ebf8a16ff369668d54fb46184a638e4df868e7ef6a55bf32e77
font_01_sfnt_off000090d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D6 5092 bytes
SHA-256: f5539f7a2436d4302a2fd79ad9f8145e744608908238279cdc7675742031813b
font_02_sfnt_off0000a245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA245 11108 bytes
SHA-256: fd1ced85d0e9fff7bcc102175fb868f57cf1f4c6b2602d22ae3b224caed71b9a
font_03_sfnt_off0000c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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