Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a724b1f0e654638…

MALICIOUS

PDF

76.1 KB Created: 2021-03-29 23:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 062680856889fadf97f792cc9dffeb35 SHA-1: 141a7b2ad284b83aa509e845135190e125ca9c8b SHA-256: 7a724b1f0e6546386ce88f61e0d9e89f3f074075f2b917321dfad269065ed16c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm designed to drive traffic to various websites, potentially for SEO manipulation or phishing. The document body is heavily obfuscated and appears to be junk data, but the presence of external URIs and the link farm heuristic strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=pneumonia+vaccine+guidelines+pdf PDF link annotation
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/icgcih8/space_programs_all_around_the_world_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/0ijugjN/doordash_ipo_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/menwjcZ/98939121947.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/RKij6hg/halloween_wallpapers_aesthetic.pdfIn PDF document text
    • https://joxalazugadono.weebly.com/uploads/1/3/1/4/131437099/f83152c0c.pdfIn PDF document text
    • https://cdn.sqhk.co/dugabolisuma/jgjdBdX/dipodesoxumanitemuda.pdfIn PDF document text
    • https://sufimademum.weebly.com/uploads/1/3/4/2/134236216/1098256.pdfIn PDF document text
    • https://cdn.sqhk.co/sidigodoga/ggijgjf/lenovo_smart_clock_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/ig3ifOG/73231557915.pdfIn PDF document text
    • http://fsfsfd.xyz/45857405616mqbfw.pdfIn PDF document text
    • http://trokot-shopnew.online/exercice_de_ladjectif_numral_cardinal60vaz.pdfIn PDF document text
    • https://mevuzujalojidid.weebly.com/uploads/1/3/4/5/134598641/nukodimumofo.pdfIn PDF document text
    • http://msertis.xyz/batigopukubufomuviwetogitz87t2.pdfIn PDF document text
    • https://cdn.sqhk.co/xezexasag/EiTwhjd/royal_family_documentary_the_crown.pdfIn PDF document text
    • https://cdn.sqhk.co/miviluwulux/jjjdzDc/59965155439.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/hahbjaO/72306207746.pdfIn PDF document text
    • https://ramenenute.weebly.com/uploads/1/3/4/5/134591972/15ed16200.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://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_2f557af7237845498c30ad497722e140.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_cfa22c66e158456bab279ba13a1c90dd.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_a2bef853c51b473891a38d3e1072675b.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_c443b2330a99444d928c71cdda3ccc47.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_a72ecfb5d405424489261b8cf5260feb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 5244 bytes
SHA-256: 259d8be5343792cada4197a6396d6c4b49defef7630fe7dc507b8cc8ce43fff6
font_01_sfnt_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 11528 bytes
SHA-256: 1bc567f37ef8ee1a72863ac921a70cd0a6c6c7a8cb2f03e9d045fbaea24a5d02
font_02_sfnt_off00011309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f