Malicious PDF — malware analysis report

Static analysis result for SHA-256 d577d5d6836b5168…

MALICIOUS

PDF

210.2 KB Created: 2021-03-11 07:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a38ebf98a21571a4fde0029296783812 SHA-1: b358825ff5f49c5a866e9bfedfe2d4e391292757 SHA-256: d577d5d6836b51681cae5163b7ec8889ec9ba0e406cd2707f553553d3ce48ace
136 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a phishing site, disguised as a free download. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. No scripts were extracted, but the presence of external URIs and the nature of the heuristics point towards a social engineering attack to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9654

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/123?utm_term=bhagavad+gita+full+pdf PDF link annotation
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/3888391.pdfIn PDF document text
    • https://pebajubidu.weebly.com/uploads/1/3/1/3/131383648/xalikinabajatu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5fcc21c561c4c.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/rirop.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/gumab.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/konozemaraxutobufodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_602b58b941fb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478408/normal_5fd8ba903ebbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_601cd178be802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_601cc85223b5c.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/kixulenolatikupamav.pdfIn PDF document text
    • https://nidewusojob.weebly.com/uploads/1/3/1/4/131438556/fesasakobutofape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01cdce7-7fe4-4e53-8e24-9ebc52491e58/zapejom.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/juviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c9b175-9565-4bbf-aff4-75b9faa60b5f/fagemuw.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/video_er_app_ipad_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7aa61b3-1052-4b6b-b0d8-9ed5893e0c4a/mogutixugu.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/bepumonedageluvudeg.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/76871537464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/856505be-f50c-4bf9-ab75-9263146715dc/eragon_full_movie_free_download_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5fd01f7-e856-465b-9db5-089f7cc87ce5/67962161880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/806bc332-e78f-4939-84ab-20f21db412ae/cardo_interfono_scala_rider_g4_powerset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/504ca64d-a6df-4037-b86b-efc1bf524ce5/daxesarijebuz.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/good_food_guide_brisbane_2020.pdfIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DCF2 5140 bytes
SHA-256: fe338f5eb7cfbf392698739ddeffcefddfdd6731c6dd0b4ce50fd017886dbc01
font_01_sfnt_off0002ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE7F 3740 bytes
SHA-256: eb903a4bcabb0673128613fc2c6a3b3be6b6be0204d11159aa2f590e1d82ee93
font_02_sfnt_off0002f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9F8 12972 bytes
SHA-256: e68be4d8eaae60c736ce7315b3b0145b85e78591d001131896cb976d2d366edf
font_03_sfnt_off0003240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3240A 6220 bytes
SHA-256: 1846932c18d12aadce51f04dbedcd2d5130a6f1fa4ad381f77c292e3933c3077