Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf77585b27ba2701…

MALICIOUS

PDF

82.8 KB Created: 2021-02-27 13:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 57c73c5a5108cb873e2b6bf05305bc97 SHA-1: fdb10ff8380316f19282538bdf04f4c8282b0d60 SHA-256: cf77585b27ba27016a838d22ecb038637bc997f14e12c780e339d3374c6d3a6e
252 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirectors and a large number of external links hosted on disposable infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text, suggesting it is not intended for direct user consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/wix?keyword=wow+bfa+8.3+blacksmithing+guide In PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/jipiramav-pumox-woxinifukizet-taxisojun.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/mujoxuwipon_bupuvafenetik_wedavux.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/fidiiIX/ligamunavurewalugubunef.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/ijn5icq/beat_my_boss_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/ibDqiic/liwinikazesiti.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/8821134.pdfIn PDF document text
    • https://cdn.sqhk.co/wafudovop/eidggjf/solar_system_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/hjRgdjh/top_up_online_3_voucher.pdfIn PDF document text
    • http://beduzevitugok.mypressonline.com/63208971609.pdfIn PDF document text
    • https://jejepijukutu.weebly.com/uploads/1/3/4/1/134131362/xezifunojopoxugiwa.pdfIn PDF document text
    • https://vifazadaza.weebly.com/uploads/1/3/4/8/134883600/gakatabuseli_giladizofumolu_kipikaxigapezik.pdfIn PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/ledisetuxe-faxotutiwuzim.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/2501577.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/sixolose/lililofixiwelanab.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/kitchenaid_stand_mixer_replacement_bowl.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/what_is_your_star_sign_if_your_birthday_is_today.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/bragg_apple_cider_vinegar_book.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/bhagwat_gita_in_hindi_book_download.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_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 6036 bytes
SHA-256: 76063e0116a17b73a2751704ad08204b1de5e9088406bc95853b09791ee9a3d6
font_01_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 16624 bytes
SHA-256: b060dee40b99196341ac860e5d84aa02019a7fa5003d4428c5aefcc6cf1c75a2