Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2344171ae082ddd…

MALICIOUS

PDF

75.5 KB Created: 2021-03-13 15:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 544ea3b2a9bbe0b10a76900b091928d9 SHA-1: bd02d18e26588a2cf78c3e44f0a33a210c830c8c SHA-256: b2344171ae082dddecac3e61f7360a6238549b67ce9502fd629387bb12d78d0f
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a malicious SEO link farm, designed to redirect users to potentially harmful content. The presence of numerous external links, including a redirector URL like https://gimoguvi.ru/123?utm_term=game+biohazard+4+mod+apk, suggests an attempt to distribute malware or phish for information. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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/123?utm_term=game+biohazard+4+mod+apk PDF link annotation
    • https://cdn.sqhk.co/lenawemijixe/jjvoggL/pbs_super_cats_episode_2.pdfIn PDF document text
    • https://sujabowumosof.weebly.com/uploads/1/3/1/3/131398195/nefafutimetamofesak.pdfIn PDF document text
    • https://cdn.sqhk.co/mikakiraw/ifmZjg7/zoposipogerisuxu.pdfIn PDF document text
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/4138910.pdfIn PDF document text
    • http://copyrighthelpcentral.com/pocket_envelope_template_free48a6o.pdfIn PDF document text
    • http://eushopvmn.site/how_to_start_business_in_pakistanrdq2o.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/chigcia/hits_radio_pride_mixtape.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/9ad7e4d3-af0a-4b88-b43c-b09511bd4c5d/by_default_excel_aligns_values.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5473f6-57f2-4e83-ae30-8d04c7573a20/47087039267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779570e0-1cf7-44f4-9dff-cda90e9a9235/vix_error_code_21009.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/form_1040x_amended_tax_return_status.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/mupibobidofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc43ba4-c718-4410-a4f3-5a48d5b5c8dd/zidilesazatolemadap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c802b472-aa98-4e5f-ba78-f0a21ce35dd6/95255391297.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/32702971906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac178a25-52f5-403f-bbfb-810bb9a96af1/81838186325.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/wosamo.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/16998417508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4040722-c5a8-40b2-87d8-0ef18082a3ed/87689493503.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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 5364 bytes
SHA-256: 55ebf4cb8fc017a2f6121ae5d765fd46015a00aea84717e656e1ff4c88dcc766
font_01_sfnt_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 11096 bytes
SHA-256: a9247702aec99e49282d64ed5c36ddf6c95a177235c450c67ff226cdd0cab0f6

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