Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36fefd8bc45faa9…

MALICIOUS

PDF

92.4 KB Created: 2021-05-24 01:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fd4b63df18bba4ce841d90bc63411fa SHA-1: cf318685e1e18aa357855e668bbe2df3b63487df SHA-256: e36fefd8bc45faa97e7ed43e33c318aec1c46f384ba1a7fd41f1b649e9caf49a
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine rankings or to host a variety of lures. One of the primary external links, https://jacksth.ru/strik?utm_term=naruto+ultimate+ninja+storm+apk, is suspicious and likely leads to a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=naruto+ultimate+ninja+storm+apk
    • https://gidepojijozi.weebly.com/uploads/1/3/4/2/134235950/gejepamuso-rojew-napipivuj-lugapuxetulo.pdf
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/waxigerasa.pdf
    • https://mosutija.weebly.com/uploads/1/3/4/5/134502389/921e4066b005e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9c4a4955-d257-4250-ada5-27f6968ad260/armstrong_furnace_lockout_due_to_no_ignition.pdf
    • https://uploads.strikinglycdn.com/files/08b9a375-fc94-40ea-b53b-59171aa68922/8836422450.pdf
    • https://uploads.strikinglycdn.com/files/2d9279ca-55ff-4c47-8519-f07eb523fcf2/acer_chromebook_15_n15q9_specs.pdf
    • https://s3.amazonaws.com/xumakomowi/36353690835.pdf
    • https://s3.amazonaws.com/fejakixoweka/3274569634.pdf
    • https://uploads.strikinglycdn.com/files/42f730cc-aa7e-404f-9f75-433c06c1463f/how_to_use_ilive_sound_bar.pdf
    • https://s3.amazonaws.com/purixifusipelid/78132639234.pdf
    • https://s3.amazonaws.com/seriposuj/xorisevusimimuwekome.pdf
    • https://s3.amazonaws.com/sixenogafopoj/tecno_android_phones_in_jumia_nigeria.pdf
    • https://uploads.strikinglycdn.com/files/36fc7259-51e7-4746-8060-dd8980ed0308/yann_martel_life_of_pi_summary.pdf
    • https://uploads.strikinglycdn.com/files/929c1e0d-e3c5-4fc5-92a1-f5aaa9d6d6e3/pakirodad.pdf
    • https://uploads.strikinglycdn.com/files/3823adbb-8d0b-41be-b437-d6c79941d92e/89224847307.pdf
    • https://uploads.strikinglycdn.com/files/30340ed3-6c48-4f60-8a2d-6d0bd089677a/zoom_h4n_pro_battery_life_phantom_power.pdf
    • https://uploads.strikinglycdn.com/files/5fbe3fc5-b84b-429a-91ab-5a28bebd7149/57912724822.pdf
    • https://uploads.strikinglycdn.com/files/3f4e0d9d-4a26-4810-bf7e-4b791fe22d87/how_to_score_the_moca_test.pdf
    • https://uploads.strikinglycdn.com/files/bd61e594-41ee-47df-a863-21c26d5e6aac/tigejiju.pdf
    • https://s3.amazonaws.com/viwoxuz/pasado_simple_verbos_irregulares_en_ingles_ejemplos.pdf
    • https://uploads.strikinglycdn.com/files/c4ce91e5-c5d6-4e7b-be75-133d46e12094/xerox_workcentre_7855_price_in_india.pdf
    • https://s3.amazonaws.com/fomudebipefasu/74774092142.pdf
    • https://uploads.strikinglycdn.com/files/965237e3-d476-46a0-8897-684c22d95650/kiwidazisizidedap.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013097.bin
e8a67dbd7705a1b1f692a6e50348a1349d23cb5d500f0c37dc96f88a34c0b9bb
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13097 28152 bytes
font_00_sfnt_off0000fb76.bin
c8d9f366d81b240899c916929eb4f06e14941c42f1dc9942f29605c202555d27
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 5076 bytes
font_01_sfnt_off00010caa.bin
a3a1283cde4ab1682873c268cfc58a795aa888d24bcf3e3f4052a9ca7bbdc743
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 10424 bytes