Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43c207d954e85e2…

MALICIOUS

PDF

81.4 KB Created: 2021-04-29 13:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c4b7b017a51a55da109e9268c30fbd8d SHA-1: 73023241af21daadb79239c1634ba1efe454743a SHA-256: f43c207d954e85e220754a4400a9d9a1258cbf4ae634da931637a21163bd8cf9
186 Risk Score

Malware Insights

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

The 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, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One prominent URL, 'https://resalured.ru/strik?utm_term=the+fall+guy+episodes+youtube', appears to be the primary lure, disguised as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=the+fall+guy+episodes+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412890/normal_6043704ff20d0.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/dhWjaia/zoxulokipujavizakalidene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5ff22492bb639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5ff419b1a43a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_60677c0de81e6.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/geXiccY/yandex_imap_settings_outlook.pdfIn PDF document text
    • https://cdn.sqhk.co/zibutodepu/cItJ3SD/ps4_controller_tester_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_65daf1d0c114411c930da1557873b6a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45854172-2e25-4567-b1c7-37b58f64d8cf/why_have_my_bookmarks_disappeared_on_google_chrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7717e301-91ad-46ca-84b4-8ad51528021b/48701732844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5d4119-9b16-4c4b-bb0d-20c937c1b156/fisasijivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848452e2-71a5-446a-b3d0-57e0c3be281e/fender_mustang_i_v2_20w_1x8_guitar_combo.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_351dc80d11c8414b9ca594a1d765c99f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe58fbe-b3c3-4f73-b0dc-e3441ea9926f/connect_ps3_controller_to_amazon_fire_stick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb18505a-a0c1-4f21-b2fc-9b2b1500bffa/python_setup.py_egg_info_check.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_900e7fb293a940609e2adbc81cc866bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/arimidex_medication_guide.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_57bccd5b25a543098528f533541a5bc7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8d4027-cbfc-4bde-a0c9-ea867f62622d/30370430238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff51d8cc-e14f-40a1-8fb3-bf4fee4e9db1/takumixuze.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/vozonosudetiwopize.pdfIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_a70b03e1d9b749f39974a9a5eca9483a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 5176 bytes
SHA-256: ad97a42ab949cf421396c4d710a305fa5d16c37e17b86c9e94787552a3af3e7a
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 9972 bytes
SHA-256: 3f4a4f4620525330e5b166f143ed1d682d410f538bbe1a188ef33b194b42d2a3
font_02_sfnt_off00012a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A48 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378