Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81b97fe5820cf89…

MALICIOUS

PDF

74.5 KB Created: 2021-02-22 15:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3d3f2a714efc15c4fba72e10dfce9499 SHA-1: 7dcbf52533da6c04290a2cf8f6c1d1336d9bb5cd SHA-256: a81b97fe5820cf89e40c343f05545bc3737139302680b19b88bb1d8e4ab1fb6f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to movie downloads, likely serving as a lure. No scripts were extracted, but the presence of numerous malicious links indicates a high likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/strik?utm_term=the+secret+life+of+pets+full+movie+in+hindi+part+1 In PDF document text
    • https://mufaguzesevulet.weebly.com/uploads/1/3/2/8/132814956/watozubulilu.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/jhOkieQ/high_waist_button_front_plaid_overall_skirt.pdfIn PDF document text
    • http://reduslimitalia.site/dumelazosewasajonuuhb5.pdfIn PDF document text
    • https://fubediko.weebly.com/uploads/1/3/1/0/131070718/namopova.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/UEtjbhh/joy_con_android_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zujijivopuju/pwhimhX/sound_equalizer_for_pc_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/iejjyuQ/popeye_cartoon_characters_names.pdfIn PDF document text
    • http://tacfitproducts.com/object_oriented_programming_concepts_in_python_with_examples26qcy.pdfIn PDF document text
    • http://specialsale.info/dezolixawrm29j.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/5000052b6be.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/3365211.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/dubiditiginowo/jifoximibuxejaz.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/mafujajuzivewuzewusevezu.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/mapugajejabopi.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/battlefield_v_deluxe_edition_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/juzafulefosi.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/free_fun_coordinate_plane_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/tekosotexuwelirujujezup.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_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 5456 bytes
SHA-256: 0ace6cad10328e664a1a39c63c6fec28ef045d234b113e3655fcfde0f4f3ded4
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10308 bytes
SHA-256: c3ae8244cdbb91f90312c67f495037743c8df8643bd66e735baa3c159defb21b

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