Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcb443f7fbbc4c2…

MALICIOUS

PDF

87.1 KB Created: 2021-03-19 06:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a4be645fcc42cf719e084a779650cdf5 SHA-1: 1d49e7ce1f3a845d2d978d1e42a37346d8ef32ec SHA-256: 7bcb443f7fbbc4c2d40b36aa1ffd39816597ab42b29c63ffcb8a6bd61dd4f4ed
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. ClamAV also detected the file as Pdf.Phishing.Trojan. The embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=ingersoll+rand+ssr+epe50+manual PDF link annotation
    • http://7lessons.website/juki_ddl-8700b-7_pricedc4uy.pdfIn PDF document text
    • http://lorem.space/rorefekokudinapaguktlk2.pdfIn PDF document text
    • http://rkconstructionsucks.com/tedawotigokozerisabowescf7e2.pdfIn PDF document text
    • http://voztrans.ru/reallifecam_premium_account_login_20wnqu7.pdfIn PDF document text
    • http://bellissimo.online/bogokasujevukixte9l.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/xofebisinuwu_nejerupuwega_kiroluzajenim.pdfIn PDF document text
    • https://fizemovumevomuf.weebly.com/uploads/1/3/4/4/134491325/soruborotilatip-sibivopavijiket-dakat-bizopenipaw.pdfIn PDF document text
    • http://lavka-karamel.ru/491685039062zet0.pdfIn PDF document text
    • http://peuly.xyz/dakes_annotated_reference_bible_free_downloadju5z2.pdfIn PDF document text
    • http://www.automotive-parts-rebuilders.com/download/ingersoll-rand-In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61fb9dc-3aac-4708-a2d9-e7dc609bd8b7/gipekesigonaranijibutire.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/chafta_certificate_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b38f09db-7c40-4285-941e-8965aad89de2/how_to_work_the_first_step_with_a_sponsee.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/the_50th_law_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea572b63-0b91-4389-91ae-43f64f04cbe2/yamaha_golf_cart_repair_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/conjunction_worksheets_for_class_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457c0a89-c5fc-486f-a391-7adbfc650963/12040520180.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/33615098571.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_aa4e1054ef554de0bbc2def32ec7e146.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewibim/bepagugulan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4827dbaf-5dee-4ffd-affd-c836f5b3ceef/imagery_in_romeo_and_juliet_act_2_scene_2.pdfIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_26814e9c090840af93358f0f04a0aa41.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_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 5484 bytes
SHA-256: b2af52b30968309027c668f97cdd765b97fc19d7989c983db410f9728546eb7f
font_01_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 11192 bytes
SHA-256: 6a39b67a752ac44f5fc3c32a5719dbbfac2c2e9fb8aabfd4422af09436d36f3a