Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5a1fccd5c4f8b9…

MALICIOUS

PDF

83.6 KB Created: 2021-03-29 23:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d28cd4d86e56abc796e5c5c56e2a749e SHA-1: e5395366d1ffbe00f13357a7b6d60799b77665a5 SHA-256: 0c5a1fccd5c4f8b9d792e91e20ead90873deb77a6ba7f95df6102c2037de6ad7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farms or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, aligning with a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://zajinet.ru/strik?utm_term=book+thief+summary+chapter+1 PDF link annotation
    • https://namosozevo.weebly.com/uploads/1/3/0/9/130969937/puwusuwepun.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/ggfgjj2/unscramble_translation_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/gda8jcX/pressure_washer_extension_wand_ryobi.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/nCnKS5x/kubotigaduzutibo.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/d1ace8cc4dcca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_6059a44f23df8.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/GgjieWr/chiari_1_malformation_decompression.pdfIn PDF document text
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/gubupozusijer-daguvikola-selig.pdfIn PDF document text
    • https://cdn.sqhk.co/jifonakilux/gcSwhiA/diesel_drag_racing_pro_best_setup.pdfIn PDF document text
    • https://kowojifab.weebly.com/uploads/1/3/4/6/134622532/b482f121b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458407/normal_5fdd63b2ba07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_600ae28e20679.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/gegiLhb/at_t_voicemail_viewer_app_for_android.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/niwadikoxuwox.pdfIn PDF document text
    • https://nenesezeli.weebly.com/uploads/1/3/0/7/130775424/bolevef.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/24fd63f89f7.pdfIn PDF document text
    • https://saripubisopa.weebly.com/uploads/1/3/5/3/135322362/wijolaligi_fefaruvewoliva_lumome_ninibova.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/didgj2p/download_texting_love_story_chat_links_mod_apk.pdfIn PDF document text
    • https://zunotexiru.weebly.com/uploads/1/3/4/8/134890048/283926.pdfIn PDF document text
    • https://cdn.sqhk.co/kopizikob/Kgfggsy/night_of_the_full_moon_diaries_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/jiLxUie/35906005378.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_6729d61e93274fd1b20f13ed8c29f050.pdf?index=trueIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_7c7f7b3ae0ba46a89928a9022889ed65.pdf?index=trueIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_85117d3d32154b46856b90cadc50a0b4.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_763a7c556cee434bae8fe7d72a31b846.pdf?index=trueIn PDF document text
    • https://854397d5-242e-4836-9f1e-4d22a5541959.filesusr.com/ugd/88a329_af8b04a99eae4d08b062c36e3af277c7.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_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 5488 bytes
SHA-256: cdce1c819efdc6028a4cb73700f4cd6e4266626d5b6e8c7c7aafdff29bf246ef
font_01_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 11540 bytes
SHA-256: 17d97738c9d86ff8415c75ac759de2a3611687fcedd0c75e7d4c076981c17eef

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