Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72c92bc03a044cc…

MALICIOUS

PDF

79.1 KB Created: 2021-03-25 13:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cacec5e0d546c1d13fd19240cdfface9 SHA-1: 5aa1fae61f3376b9f3d7e81a233485c0aea6d1dd SHA-256: b72c92bc03a044ccd3e2a9af07bb2ce5c4c1ab7a45033bb4001fe9467807b78d
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://xajibur.ru/award?keyword=bridal+party+games+pdf', appears to be the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/award?keyword=bridal+party+games+pdf PDF link annotation
    • http://everydays.space/what_do_you_do_after_bottle_grotto_in_links_awakening9sens.pdfIn PDF document text
    • http://regse.website/295361155696g2jc.pdfIn PDF document text
    • http://axecheat7.xyz/remington_700_sps_stainless_30-06_reviewsodx40.pdfIn PDF document text
    • http://help-mediasupport.com/diridijuwidivexuvokixokuc86u9.pdfIn PDF document text
    • http://phrensy.co/051_av_stihl_parts0b142.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_e6d8dd7841734869ba710eb4ce9d039f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd655ca-24e0-4032-91dd-5e45ab9f0e49/reading_the_bible_in_120_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10008f3d-0a87-4d85-b440-80b25738c8b5/89470260365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1954c10f-5658-4425-8677-642dc0f2238a/little_black_boy_fade_haircuts_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/23573187542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0754c247-3015-438a-9700-5ee017226792/wutubebafunin.pdfIn PDF document text
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_4d6dda4fd0cb45e280a531d7f891784e.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_07f9f269ff8445c097b13bca9bc531ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf93da4-2e03-4006-a97a-fdb3c5011b75/sevuzujedufajakolima.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_69411de2584d4fa39f0ec86d1147dccf.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_bc12989a55e44f709fd5779836679d58.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_6ab72793dd044c29b0ea914e59191030.pdf?index=trueIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_0f121b71192f4f3782bc9b7db4016dd5.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_2fd56ab5a27d4304be4501d27e5111c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/wifuxuzomaroxejij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6ef552-374a-430a-a8bb-578f8e8dd840/forged_in_battle_miniatures_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/big_data_vs_data_mining_vs_machine_learning.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_97490efb444b4b8ba0e11e552fc1acd7.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_887401b6344b4bc6a4e52131b583c1f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukut/boxukewofadigozatiradi.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_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 5512 bytes
SHA-256: 1219b97492ca8cca140c3f35f6864af0dba16a04df7044be10c108caab1f038e
font_01_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 10596 bytes
SHA-256: b83f32ce77b286313f75a77621d2268c9e239163b4305c8afdc0436b41ef9882