Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c35381f5ef2d680…

MALICIOUS

PDF

80.4 KB Created: 2021-04-09 03:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c775ecb0b138f9c3472ec4baaf8e7d6e SHA-1: dcf3fd96489cbc977304880cbac6a77afeabb5ee SHA-256: 9c35381f5ef2d680bb5f4f0f3e461c2d0b5448e7e78584b49fc1834a334daf51
154 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 dafemum.ru, disguised with a seemingly innocuous search query. The ML classifier also flagged this PDF with high confidence, and ClamAV detected it as a phishing trojan. While no scripts were extracted, the embedded malicious URL is the primary indicator of a phishing attempt, likely intended to deliver a secondary payload or lead to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+crochet+a+sweater+for+a+dog+beginners In PDF document text
    • https://cdn.sqhk.co/nojedevatas/gdhGgFL/defender_land_rover_for_sale_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/ludibipimilu/gljhjeQ/word_family_oxford_english_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/xWFhbzb/2nd_grade_math_test.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/iibMBGo/juwav.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/zakoniwodubedakil.pdfIn PDF document text
    • http://xegomivuz.iblogger.org/buzolosexesinitikubu.pdfIn PDF document text
    • https://kisisixixugejo.weebly.com/uploads/1/3/0/9/130969502/d56eb52ecc.pdfIn PDF document text
    • http://buporakowun.22web.org/overcoming_functional_neurological_symptoms.pdfIn PDF document text
    • https://wozukaziximuru.weebly.com/uploads/1/3/4/5/134587045/bokomekojume.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/vuxelakunasipaled.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/kevava/android_games_pc_support_software.pdfIn PDF document text
    • http://mulukamuzadesew.epizy.com/luvilunegugiduxiwadadij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1be6fd34-9454-4208-ab98-85c7b58c1722/5.1_right_triangle_trig_review_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/wallpaper_free_flowers_desktop.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_12b54731a1d94dcc84f6fc3a1f7b8b81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18527107-cad7-4556-af40-a3fa01cf1ccf/91327467762.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/goduvaratowovosaviled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b309a3-4428-4ac9-96a9-dc9507aa3aab/better_than_ever_lyrics_my_little_pony.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/makupunesetofimavi.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/depression_and_anxiety_scale.pdfIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_08633c87b3da463582001ea96a9a1328.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_b9c88d06b6f14d469790ba4b03a506f9.pdf?index=trueIn PDF document text
    • http://dejogamolefip.rf.gd/bbc_news_android_app_apk.pdfIn PDF document text
    • http://ludodugadigepez.rf.gd/overt_aggression_scale_oas.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_3e26b5f9a8184d148c564647b3a1f1a3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 5444 bytes
SHA-256: 4cb49aeeb723598d40b3362fa3558c39bda4afa229a0f31a1807a34181d7df68
font_01_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 10944 bytes
SHA-256: ec195b968812b8e7407dab6da618b4a264fa11c30bf8000558371cc5c3186077

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