Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd8d1a8a184c97e…

MALICIOUS

PDF

87.4 KB Created: 2021-05-17 18:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4df6c4a3cf833bd6c53c3921bb006855 SHA-1: d79fd7fcc33c0807b2f859fa84ab4cc50982a418 SHA-256: cbd8d1a8a184c97eca0ceda375db8eb0d28d8bc7e5f6a65911feed16b11e2449
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 hosted on disposable domains, indicative of a link farm or phishing operation. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded content, though heavily obfuscated, likely serves to redirect users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://nipisod.ru/strik?utm_term=what+does+submissive+mean+in+a+relationship PDF link annotation
    • https://cdn.sqhk.co/famazipow/bibhgij/formbuilder_angular_4_reset.pdfIn PDF document text
    • http://1offpark.xyz/bmw_x3_maintenance_cost_india097pl.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/2902430.pdfIn PDF document text
    • https://cdn.sqhk.co/nugubirudif/6ihhbs7/bin_sachivalay_clerk_paper_2016_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/jiijChf/12103160355.pdfIn PDF document text
    • https://cdn.sqhk.co/goxupolofodi/ChfCJMz/tasaguwederoxopigoral.pdfIn PDF document text
    • https://mobefoba.weebly.com/uploads/1/3/0/7/130776725/92c336d2fc5bd6.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/cgcgcca/72295731146.pdfIn PDF document text
    • https://xowemaxixedire.weebly.com/uploads/1/3/5/3/135325030/muwolagexukizuv-pivukexesipuzu-gilikimawe.pdfIn PDF document text
    • http://esportzmlevent.com/what_is_end_stage_arthritis_of_the_shoulder5f1jc.pdfIn PDF document text
    • https://sazagirisama.weebly.com/uploads/1/3/4/5/134585928/zanozizonawatojiwex.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/QheNjgm/2834067391.pdfIn PDF document text
    • http://minuette.me/19667129959wjug.pdfIn PDF document text
    • https://muwujexowosis.weebly.com/uploads/1/3/1/4/131437891/gidose-joduxexu-sufazogib.pdfIn PDF document text
    • https://rirulejirosajis.weebly.com/uploads/1/3/4/3/134320684/turefaxebo_tijevopo.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/1JgfDmm/highway_301_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/fupetabuwuf/jdn7ifk/easy_mobile_recharge_app.pdfIn PDF document text
    • http://thehensleys.org/biruvorakazutasi8lerf.pdfIn PDF document text
    • https://nawuwisenaz.weebly.com/uploads/1/3/5/3/135318134/7f7954011a9a94.pdfIn PDF document text
    • https://mafoguwof.weebly.com/uploads/1/3/1/4/131438304/2551644.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/cRgcYXC/sojotukepuf.pdfIn PDF document text
    • http://premiumpornclips.com/kozeda12xq6.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/pm9ihak/15295879675.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/3068d465.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/409684c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_68e84ce2df20480b940e7629da88a1f5.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_99c4d25c50d64493928843ebea1578b6.pdf?index=trueIn PDF document text
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_3f3c23992b4a4d74887c667182f5f7ae.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_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 5412 bytes
SHA-256: fd3360f80f5ce814e6ba3e34b897aae3d130a1521d659fabdd8a185e0b2907c9
font_01_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 10532 bytes
SHA-256: e9fac2d6b434ca4bcaa6dedf9c825dfa96a4f16043f0f1dcb76115d802f6bde4

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