Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb07440a07fd9a22…

MALICIOUS

PDF

78.9 KB Created: 2021-03-14 10:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48681c7234b936279422eb6dc829200e SHA-1: 24366095c4fa6cd495a8c70e59d84e5708c5503e SHA-256: cb07440a07fd9a229ec427ab8697805c7286f04c5e18b1a0770450cba9918ff4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://jacksth.ru/strik?utm_term=how+do+you+write+a+90+day+plan+for+a+new+job, which is likely used to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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=how+do+you+write+a+90+day+plan+for+a+new+job
    • https://cdn.sqhk.co/sovebiba/ififjdk/43666564338.pdf
    • https://cdn.sqhk.co/tibidimewako/oytjgdZ/young_guns_2_cast_jon_bon_jovi.pdf
    • https://cdn.sqhk.co/xaxovowupofa/mjiUGI8/11974704655.pdf
    • https://gazolono.weebly.com/uploads/1/3/4/7/134721713/worafajumifo_lowegige_xadunemonakiga_vizesevala.pdf
    • https://cdn.sqhk.co/vaminika/bKLDge5/kokose.pdf
    • https://mituzeru.weebly.com/uploads/1/3/2/6/132681412/6781626.pdf
    • https://cdn.sqhk.co/noneniwetav/Oja3Igc/ivry_vr_setup.pdf
    • https://cdn.sqhk.co/fakineduxafe/UUakjhd/80s_video_songs_tamil_download.pdf
    • https://wejolizamu.weebly.com/uploads/1/3/4/7/134766198/pimek.pdf
    • https://cdn.sqhk.co/segevenujuka/igidwb7/teppanyaki_grill_restaurant_near_me.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c701141b-fd8f-4f06-ab7e-4b2e229ebb7b/symbol_wireless_barcode_scanner_battery.pdf
    • https://uploads.strikinglycdn.com/files/ca444197-c373-4656-81a9-8f77f45050c2/1997_dodge_ram_1500_patch_panels.pdf
    • https://s3.amazonaws.com/pibabopuduj/43360023359.pdf
    • https://uploads.strikinglycdn.com/files/58c5f4af-dcc7-4bd8-96d6-14f7c7c16c9f/creative_sb_x-fi_driver_windows_7_64_bit.pdf
    • https://s3.amazonaws.com/lusegokaves/26459665233.pdf
    • https://uploads.strikinglycdn.com/files/ccdbdbba-5a80-4668-91bc-d4d5f29b01b5/807623682.pdf
    • https://s3.amazonaws.com/xuzakob/41309486819.pdf
    • https://uploads.strikinglycdn.com/files/eccd3d29-fd17-47fe-9e95-1aa5c1e58857/panorama_english_book_class_10.pdf
    • https://uploads.strikinglycdn.com/files/97cae42b-f8d0-4fd0-9813-fc0a0aeaca54/does_dominos_come_with_dip.pdf
    • https://s3.amazonaws.com/risalenefazozo/begebefowutupokixitinubof.pdf
    • https://uploads.strikinglycdn.com/files/e422f0a4-f419-4514-8882-7e993087c964/why_is_my_dvr_not_recording.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7eb.bin
802d1350297d3fb06657934dfbd17f798436c31671140803a379d1991d5353c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 5528 bytes
font_01_sfnt_off00010ad3.bin
7285628019b80557614290790bfb9a6d0292263ef4e66ce5a88a826d393a607d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 10284 bytes