Malicious PDF — malware analysis report

Static analysis result for SHA-256 139a9170b2809cd8…

MALICIOUS

PDF

71.5 KB Created: 2021-03-08 16:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b08e4281618e3bd299b23d5c9f870444 SHA-1: 6f3790ee35515b1fa729af999f1669aad3faad6d SHA-256: 139a9170b2809cd8c6daf017625d4089a4ee466d437a5c5d1141cc87e46c13f4
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 are SEO-optimized and point to other PDFs, indicating a link farm for search engine manipulation. The primary malicious URL, https://maypoin.ru/wix, is likely used to redirect users to malicious content or phishing pages. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/wix?keyword=the+believer+authority+kenneth+hagin+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469359/normal_602a4bb727e44.pdfIn PDF document text
    • https://vatemiseviweriw.weebly.com/uploads/1/3/1/4/131453097/jubalalixilogud.pdfIn PDF document text
    • https://bufamugogok.weebly.com/uploads/1/3/3/9/133986728/vafukasikaf.pdfIn PDF document text
    • https://dalemugoxopil.weebly.com/uploads/1/3/4/5/134587536/jeguguze-visuxi.pdfIn PDF document text
    • https://lodipopigib.weebly.com/uploads/1/3/1/8/131857338/setok_sidezexupu_damite.pdfIn PDF document text
    • https://fixubosadad.weebly.com/uploads/1/3/4/6/134658154/lokiroduzuwinopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_6033997d03426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_6031bd773aefc.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/zejiwu-sasemojave-mexesijamedu.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/7fd2f0.pdfIn PDF document text
    • https://liziwisop.weebly.com/uploads/1/3/0/7/130776804/8670581.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ropuba/38734684057.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/special_26_songs_pagalworld_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/26716136707.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/giwexunadojif.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/97300846428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7897c6f-6f09-4df8-8444-41834efcbc5c/sun_joe_pressure_washer_wont_use_soap.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/mozilla_firefox_49._0._1_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f0e4f7-1c26-4665-b2d2-f499a7fed0bd/asp.net_core_mvc_route_config.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/merge_excel_sheets_into_one_python.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/64542718192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae501d6-2b83-4a69-b509-95d9b5f65db4/how_do_i_fix_the_latch_on_my_ge_dishwasher.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 5532 bytes
SHA-256: 4deed8cde03e82f048c1fcb105192aee5b67e63c3dcc3efe2e5cb8af7d4a7d83
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10636 bytes
SHA-256: a6e5ed94114ec35b73b87efe307b5943562ccc65a76588a96d8c66983211937a

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