Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ad4a995cb3dbb6…

MALICIOUS

PDF

75.2 KB Created: 2021-03-22 16:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ed97cb534f3d7040cccc117e41af81d SHA-1: 7a7f1e895cef83984d93e7edcd4de6998cc97071 SHA-256: 53ad4a995cb3dbb6cfed4c8019d9f5fcf780c912628dcb40358db03f4b396530
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. It contains a large number of external links, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'chemistry equilibrium lab answers', likely to trick users into visiting the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=chemistry+equilibrium+lab+answers
    • https://pizijejubuga.weebly.com/uploads/1/3/4/8/134883891/4120021.pdf
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/6662366.pdf
    • https://webavetoromezo.weebly.com/uploads/1/3/5/3/135346546/db7b2e3bd081f.pdf
    • https://ninitirasaru.weebly.com/uploads/1/3/5/3/135317350/32cb0f.pdf
    • https://ninapivojejuru.weebly.com/uploads/1/3/0/7/130775346/putolopojate.pdf
    • https://kapadarobuziwel.weebly.com/uploads/1/3/2/6/132696145/5226349.pdf
    • https://sunajojafexa.weebly.com/uploads/1/3/1/8/131856627/peluvudinuwopove.pdf
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/9707650.pdf
    • https://belujewirozem.weebly.com/uploads/1/3/2/6/132681559/f3a74e8b1e6efe.pdf
    • https://wiwovadale.weebly.com/uploads/1/3/5/3/135322143/dadavafab.pdf
    • http://rimujitibux.mypressonline.com/essentials_of_diagnostic_microbiology.pdf
    • https://fafodedok.weebly.com/uploads/1/3/4/6/134602811/serigonobuteviw_ponokilivan_wamuxoneforizip_mekiwepodupi.pdf
    • http://vaxiliwu.medianewsonline.com/tizesimusijabe.pdf
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/8471060.pdf
    • http://demumamudu.22web.org/common_errors_in_spoken_english_ppt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://saxogif.epizy.com/grey_bed_sheet_sets.pdf
    • http://resifidivef.epizy.com/atresia_esofagica_asociacion_espaola_de_pediatria.pdf
    • http://suxivivuvadife.rf.gd/47017766920.pdf
    • https://s3.amazonaws.com/dujepav/wolekanilitugujofuwajewiv.pdf
    • https://s3.amazonaws.com/pojikovewijeja/nfl_schedule_2019_week_1.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_off0000e912.bin
4132fabf8f343c91d88a73039b3e83ec02ff8752a6074f899ec8dea263ae011f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 5288 bytes
font_01_sfnt_off0000faef.bin
94e7964b5ea7da164a131e714dfab88890cc697451854f67cd2efef78cc16ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 10956 bytes

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