Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b53bc5547270cd6…

MALICIOUS

PDF

81.8 KB Created: 2021-04-07 14:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010dea974e8d1ba13e292c1658ea5f13 SHA-1: 7916b29d37b42117914848923948371a7f2e9c8b SHA-256: 1b53bc5547270cd6a9f797abdda18fd24bd9352821af97ed7e7e685b7616e72f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many of which are likely part of a link farm designed to obscure the true malicious destination. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is used to redirect users to potentially harmful websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=spanish+2+honors+final+exam+review
    • https://cdn.sqhk.co/girolivudafo/gdghiho/puxifojejusoz.pdf
    • http://kofuxasapaduk.iblogger.org/65196524553.pdf
    • https://cdn.sqhk.co/jotepomi/k3riilK/best_rock_songs_of_the_80s_and_2000s.pdf
    • http://nukicew.xyz/33728437564l1hsm.pdf
    • http://healthytrands.com/rebuilding_database_ps4_risksvmhy6.pdf
    • http://eroganoficial.site/fujitsu_document_scanner_fi-7160_price_in_indiab3dog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fudeviwevexa.epizy.com/sinusoide_formule_d_berekenen.pdf
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_196c51afa8ac4441976828792cd9e947.pdf?index=true
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_9c32eadf83a54b8cb0baf0d79111cf38.pdf?index=true
    • https://s3.amazonaws.com/wanasuvedigo/vesojow.pdf
    • https://s3.amazonaws.com/regovadeje/how_to_use_sandisk_ixpand_flash_drive_for_iphone.pdf
    • http://lerezivopo.rf.gd/media_clip_pro_video_er.pdf
    • https://s3.amazonaws.com/sakaburepagase/rider_waite_tarot_book_depository.pdf
    • https://s3.amazonaws.com/bojafazes/what_is_the_absurd_in_the_myth_of_sisyphus.pdf
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_514df257162f4e26b3dac28cbcc31d28.pdf?index=true
    • https://s3.amazonaws.com/godoremitiwuja/lg_sk6y_soundbar_manual.pdf
    • https://s3.amazonaws.com/sevoga/skyworth_58_led_tv_review.pdf
    • https://s3.amazonaws.com/wejuvono/romiweguporo.pdf
    • https://s3.amazonaws.com/nolarifaforuxop/93397107087.pdf
    • http://mofuwokive.epizy.com/ronoveridebolimelezixi.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_off0000fdd6.bin
b6278fa13b9c3d72abb7e3e584dadf0130af364e632807d2bc74b313bcd8481b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 5596 bytes
font_01_sfnt_off000110ca.bin
69439bf925ba315a16d78e6440a4580d65ec6beafd67eb7cacc1696c422ff4c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 12936 bytes

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