Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0feafdc1b2fff5…

MALICIOUS

PDF

81.1 KB Created: 2021-05-10 05:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0778cf62ef260286bd6939a774c9007 SHA-1: 9c2793e970e634dca0fd9dfe48e8b6a12a7ad40d SHA-256: 5f0feafdc1b2fff5e2ba8e1dd98e787a3dc66689ee5d8b9d8a31ad7a948b5940
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/strik'. This link is presented in the document body with a lure related to downloading games. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs and ClamAV detection further support a malicious classification, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=how+to+download+games+onto+ti-84+plus+calculator
    • http://sabaroxuxonefib.iblogger.org/compare_scarlett_2i2_and_2i4.pdf
    • https://cdn-cms.f-static.net/uploads/4454047/normal_6021d1fca7bd2.pdf
    • http://mitutepoka.medianewsonline.com/2005_honda_civic_transmission_replacement_cost.pdf
    • https://cdn-cms.f-static.net/uploads/4450509/normal_6058dbfee88c9.pdf
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5fed79ba7a9cc.pdf
    • http://xobokalute.iblogger.org/cadena_de_suministro_unam.pdf
    • https://static.s123-cdn-static.com/uploads/4456166/normal_6007374f3fdf5.pdf
    • http://winovigamaj.mygamesonline.org/beatspot_book.pdf
    • http://zumepaposakuf.scienceontheweb.net/staff_accountant_interview_questions_and_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4501774/normal_6007d69c632d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mexijegedakol/namalojusiz.pdf
    • https://uploads.strikinglycdn.com/files/163d4cc0-b3c8-4eba-a636-83f6351d01c9/what_is_the_difference_between_dog_and_cat_fleas_the_same.pdf
    • https://s3.amazonaws.com/xupimaral/97998122250.pdf
    • https://s3.amazonaws.com/rerinago/brutal_age_mod_apk_new_version.pdf
    • https://uploads.strikinglycdn.com/files/18fea239-be27-421d-ae07-c3608d0a48e5/94640236163.pdf
    • https://s3.amazonaws.com/zuvovoxigumuz/how_to_replace_flat_top_stove_element.pdf
    • https://s3.amazonaws.com/petikamov/badlapur_movie_hdmoviespoint.pdf
    • https://s3.amazonaws.com/vavale/good_informational_writing_topics_for_6th_graders.pdf
    • https://s3.amazonaws.com/zedudo/93775246805.pdf
    • https://s3.amazonaws.com/wazorixekunafob/line_graph_worksheets_1st_grade.pdf
    • http://titasukutisun.epizy.com/pak_studies_class_9_book_english_medium_2020.pdf
    • http://vejawotivifima.rf.gd/butterfly_valve_assembly_catia.pdf
    • https://uploads.strikinglycdn.com/files/9898841a-cf0a-4b8b-a338-afd99ec8dc1a/kisaxuzupuraxu.pdf
    • https://s3.amazonaws.com/limewub/how_far_is_it_around_lake_calhoun_and_lake_harriet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f165.bin
cbb52481ce94e16f1aa7c1e5556943e0858c32639ae52c58d7d3596933ba349e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 3016 bytes
font_01_sfnt_off0000fc21.bin
183f5f462b86d9f25c4689b786b23c90f08ac26dfa323edc669b73367fd09e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 5760 bytes
font_02_sfnt_off00010fca.bin
6c906c941618a7bbfcb6b453c32efc8d6898e90e1616e9d0b69bd64768f51ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 11220 bytes

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