Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbcd7530a9d890a…

MALICIOUS

PDF

79.9 KB Created: 2021-04-28 07:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3f61235786320ae5ca2bef4b04d23c3a SHA-1: 70a2124991839853d6922d6b371a8163f701125b SHA-256: 0cbcd7530a9d890a839469ac1e92546f33da6381e1f598ad6c5628e670ca714f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=how+to+start+a+grief+group PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469351/normal_5fe9069aef538.pdfIn PDF document text
    • https://cdn.sqhk.co/zawukomofise/chhhgcd/luvuzukeneli.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/gfugeie/99865457548.pdfIn PDF document text
    • http://aov.one/192317003113xrmq.pdfIn PDF document text
    • http://zobaxuriz.iblogger.org/baacoo_afaan_oromoo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_600d90ccb8907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466996/normal_5ff82a4175ed8.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/hd4zjen/charlotte_s_ice_cream_tripadvisor.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/ggjxzid/14645213484.pdfIn PDF document text
    • http://ruxedetijonenik.iblogger.org/expert_apache_cassandra_administration_download.pdfIn PDF document text
    • http://freud.icu/17029277710kv71h.pdfIn PDF document text
    • http://grantmedica.ru/xobuwatimefakevufottw10e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_5fda17384741d.pdfIn PDF document text
    • http://sfhgfje5df.xyz/vunoz8s0c3.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/highicj/4k_video_editing_windows_movie_maker.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
    • http://bewefesa.epizy.com/bukelovem.pdfIn PDF document text
    • http://futilanejorowof.epizy.com/nurera.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/7152370021.pdfIn PDF document text
    • http://pupowupavil.epizy.com/78534686377.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/1976909542.pdfIn PDF document text
    • http://xiwezolemamu.rf.gd/complementary_and_alternative_therapies_in_nursing.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/god_hd_wallpapers_1080p_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 4864 bytes
SHA-256: 20ac59fb55d2f12a6229bf0ca1a93fcea5d6cbac8044084cdb426d8b934f03f8
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 10664 bytes
SHA-256: e54ad15e801015d40ebc2062e62d042b3be408dffcc3d220d43f2fd432fc273c
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e