Malicious PDF — malware analysis report

Static analysis result for SHA-256 a549035bc5ba634c…

MALICIOUS

PDF

75.7 KB Created: 2021-03-10 02:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e3eca3d691455c90888699eda9b725e0 SHA-1: c806e1430d86f4900fd4e1d76fa7713f3aa2c3e0 SHA-256: a549035bc5ba634cdfe4c0d489f666a5e7ffb2c5af6f73f6ce10241382cde276
186 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a PDF phishing or link farm. It contains a large number of external URLs, many hosted on disposable domains, suggesting an attempt to distribute malicious content or manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent, likely related to phishing or malware distribution.

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://pelibifir.ru/award?keyword=addition+and+subtraction+of+integers+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/tebefaravuz/evgiAhd/61419952634.pdfIn PDF document text
    • https://cdn.sqhk.co/felebamifuk/fhbx515/40881856913.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/hTjiih9/susegi.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/jgiR15c/anime_girl_wallpaper_hd_1080p.pdfIn PDF document text
    • https://cdn.sqhk.co/nudogada/gvqFaib/space_armor_2_download_uptodown.pdfIn PDF document text
    • http://tivepijezar.22web.org/18967027501.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/Fchdop3/management_sales_trainee_salary_sherwin_williams.pdfIn PDF document text
    • http://sewaseg.22web.org/working_environment.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/Tjfhf6C/wakikepag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/hp_designjet_500_printheads_not_functional.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/92558470056.pdfIn PDF document text
    • http://wilikomezavute.rf.gd/49616150142.pdfIn PDF document text
    • http://simarawi.epizy.com/adarsh_credit_cooperative_society_balance_sheet.pdfIn PDF document text
    • http://kuwokezolofe.epizy.com/gupipazalopidixowarupi.pdfIn PDF document text
    • http://fivulesesixiji.epizy.com/google_dictionary_translate_spanish_to_english.pdfIn PDF document text
    • http://darajakejaxise.rf.gd/cashflow_game_by_robert_kiyosaki_apk.pdfIn PDF document text
    • http://nonepajurela.rf.gd/android_ndk_examples.pdfIn PDF document text
    • http://bavubuseji.epizy.com/54391570619.pdfIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_be0ac1ed69d2451bae8b453bc5fbf572.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/vomilivusikojitajaxogif.pdfIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_9594e85f722047f8bd982dfc007df71e.pdf?index=trueIn 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_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 5672 bytes
SHA-256: 5e7155b9f845d09e2ccaf956a35857deb151c150cc3e7eeb42e60b8cf6b957da
font_01_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 10520 bytes
SHA-256: fbd82d9d96cb40ed47faacdf138c8566a3ae677b327f4e7233393b956444f91c

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