Malicious PDF — malware analysis report

Static analysis result for SHA-256 587631ebaaf4887b…

MALICIOUS

PDF

89.6 KB Created: 2021-04-04 19:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9e9419fb3b16f6896ff25c2ec81ae9b9 SHA-1: 8665bb3695b4ed417a330d56bd2c9df99ee294ba SHA-256: 587631ebaaf4887b9573277ba6fe0728a7eeda6897410c23a7c7e3539cdc28fd
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique commonly used in phishing campaigns to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link-farming or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=cards+against+muggles+online+pdf PDF link annotation
    • http://gloslides.com/bopobinupuzjzkh.pdfIn PDF document text
    • http://presentinsta.online/28295087543naac1.pdfIn PDF document text
    • http://com-connexion.xyz/what_time_does_big_little_lies_air_on_hbo9y7t9.pdfIn PDF document text
    • http://pasendapp.online/kesuwoxivujibk9b4n.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/aristotle_politics_reeve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopafulobitap.atwebpages.com/karovokatoxupixekogasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4644960-09de-45d5-a858-0d522486fe00/69107309318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5048687b-0a59-46df-ad9e-657bb3c03a44/whats_that_song_on_tiktok_that_goes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3460a2-1b41-4e4b-9aa4-b539dcbf2cfa/the_stand_cbs_all_episodes.pdfIn PDF document text
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_e3b6df6f3f764f6c9e59015a794abd84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5801a1a9-1c58-428a-a98c-162cbff1dad2/the_stars_are_coming_out_tonight_david_bowie.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/20480182530.pdfIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_d61ee4f2a67a40679e92751f187c6d37.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_be5b0dc799964738a882279c2e96dd04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/wefujozipefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae9886d-8875-42c3-bb1d-8597c9db8c25/logitech_z506_5.1_surround_sound_speakers_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/jaxel.pdfIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_9ec12ce22c59467e8fd290f1f4d11dc9.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_766312857e294467bd1821bb9dc899ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fef372-384e-4d3f-991a-c4a0f4eb64a1/bipagitanudipudewawev.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/10084986481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a962e5-3e9e-410b-b73e-c2c47d50cf82/mantak_chia_wife.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_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 5268 bytes
SHA-256: 95e8b4896df7d873e3cc749ee67a869159fee4c97269f8b465ed4342307f5768
font_01_sfnt_off000132b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B1 11368 bytes
SHA-256: ecf2afbdb4d2674bb2473a168faef442e1178d15d501550f6a61600bdc65d518