Malicious PDF — malware analysis report

Static analysis result for SHA-256 f565f275f257dd1e…

MALICIOUS

PDF

90.2 KB Created: 2021-03-06 03:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1e9b3413bca618996e654f8adafad875 SHA-1: 5e0b928ea8f0dd9ee3e0251768d8b7e662bed917 SHA-256: f565f275f257dd1ee28acfdb9e5371c10d5733bbf1eb1da9ecac5d3c3eca702c
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs and a heuristic firing for a malicious redirector link, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily corrupted, contains text related to 'apk download', reinforcing the lure of downloading an application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=face+model+3d+apk+download In PDF document text
    • http://opensalle.xyz/what_is_the_theme_of_three_skeleton_keyzdewg.pdfIn PDF document text
    • http://vadusulu.iblogger.org/donald_duck_meme_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_603758e5cbbd0.pdfIn PDF document text
    • http://otshelnik.net/risurisuloparirivumuzuka1am.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379231/normal_5ff5ccef0da50.pdfIn PDF document text
    • http://musofiron.ru/percentage_increase_decrease_questions_and_answersveqfv.pdfIn PDF document text
    • http://discount50it.pro/livadurafew6hy2p.pdfIn PDF document text
    • http://relax35.ru/wezebevawogebabukupemefvzb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_60301ad2ed450.pdfIn PDF document text
    • http://premial.su/valkyrie_profile_lenneth_true_ending_guidetmc3t.pdfIn PDF document text
    • http://wozutujetotox.iblogger.org/vubewugewifuwura.pdfIn PDF document text
    • http://lessonsonline.site/89300345539tusta.pdfIn PDF document text
    • http://opensalon.xyz/xisanofuduvimux9cui.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff019fa8-bf77-477d-93f7-202ca0197971/kotuwidanapub.pdfIn PDF document text
    • http://kelakubusadifi.epizy.com/tirezevifukuvovoveloxivu.pdfIn PDF document text
    • http://sewasijibakel.epizy.com/83586238623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee661b76-fb4d-4a3c-88ad-c3a809f6c7b4/where_can_i_drop_off_used_clothes_during_covid.pdfIn PDF document text
    • http://jepisaf.epizy.com/short_film_budget_template.pdfIn PDF document text
    • http://dekamikopegem.rf.gd/harry_potter_and_the_order_of_the_phoenix_chapter_12_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9321fcb0-8532-4f95-ac17-58e3b34e4bce/the_dating_game_book_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e449c8b-2282-43a0-ba00-d19d6af08c38/19189090515.pdfIn PDF document text
    • http://zenejifawulo.epizy.com/73334512606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02179153-37a2-4ef3-aa9b-15c3fca115b2/63048165624.pdfIn PDF document text
    • http://pezusor.epizy.com/74432138546.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 5220 bytes
SHA-256: 109610ec103d2d7042ad0777a95a463af3f879a99c101ef24d23515080bfa0c8
font_01_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 11608 bytes
SHA-256: 390ee591ce419e9353326f22c8be383551f51855fd5caf188477ad1ba98f4b94
font_02_sfnt_off000145cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CB 16264 bytes
SHA-256: f3d57df04cdb194e46cfff8b4835c5d2f279e7288315b2039a53678039656b22

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