Malicious PDF — malware analysis report

Static analysis result for SHA-256 d524b152f5176f88…

MALICIOUS

PDF

75.6 KB Created: 2021-05-01 05:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb1eadce03ec406796c4809bb3bee03c SHA-1: ce11773651c856ca502e37f4e553cf9b6642ec29 SHA-256: d524b152f5176f888c3521f2df6a11880840a55aa155dc58c2e092b490d96dc9
156 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 appear to be part of a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the document body suggest a lure related to exam information, which is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/strik?utm_term=how+hard+is+the+medical+assistant+exam
    • http://jobauthor.online/nobaxikubegunofejajelupawxvgg.pdf
    • https://garituba.weebly.com/uploads/1/3/4/3/134335889/vusupisapop.pdf
    • https://guwokizesagemi.weebly.com/uploads/1/3/4/8/134855090/4947378.pdf
    • https://zosifoke.weebly.com/uploads/1/3/0/8/130813504/7a1b19794c.pdf
    • https://magivuvesef.weebly.com/uploads/1/3/0/7/130775451/5c0ec3208bf4cb2.pdf
    • http://idem-peshkom.ru/vofevosakabasegegawejilwbkq.pdf
    • http://circleshtang.xyz/xu_n_nh_cc_truyenfullngmb2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d1cdad73-2255-428d-aa20-00a73d9d708c/oracle_12c_and_19c_difference.pdf
    • https://uploads.strikinglycdn.com/files/c9fc4f22-92da-4202-97e1-5d065492476d/kiponetawezikuxodajefigu.pdf
    • https://s3.amazonaws.com/gomaxod/work_permit_application_form_japan.pdf
    • https://uploads.strikinglycdn.com/files/4ca67be5-a2c9-48a3-ad32-9072ed4b4eb3/how_to_open_black_diamond_storm_headlamp.pdf
    • https://s3.amazonaws.com/vukumesoj/princess_mononoke_ost.pdf
    • https://s3.amazonaws.com/mikibetiv/8592431084.pdf
    • https://uploads.strikinglycdn.com/files/5b8a6cf5-afeb-4785-a60d-e9d79d5dc62b/who_goes_there_book_buy.pdf
    • http://tutedenomazul.epizy.com/ip_scanner_24_filehippo.pdf
    • http://tudavoje.epizy.com/how_to_write_a_travel_writing_piece.pdf
    • http://rupilozomu.epizy.com/7082914864.pdf
    • http://jezawirigi.epizy.com/7225830306.pdf
    • https://uploads.strikinglycdn.com/files/d886d8a4-0073-4b0a-bdd7-5769c062cb7c/basirupupujupunepavum.pdf
    • https://s3.amazonaws.com/libosokune/what_does_it_mean_when_my_smoke_detector_beeps_twice.pdf
    • https://uploads.strikinglycdn.com/files/0ac53905-9ef3-4f2a-87e7-45311e204f50/28473230072.pdf
    • http://regujivabi.rf.gd/disamiti.pdf
    • https://s3.amazonaws.com/susonanezaj/watts_up_electric_power_worksheet_answers.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_off0000ead0.bin
98b6c1e1d2a9a8dd3f5e8ca03b6c8b7f9b14232d52ff2a043e9361c6ad85056b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 5300 bytes
font_01_sfnt_off0000fcbc.bin
6b812a81c27e66a38363b3ba39a4268b9b569923cc85b693a2da14a6cda0aaed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 10832 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.