Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a55c84c2e287b55…

MALICIOUS

PDF

75.3 KB Created: 2021-02-27 15:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7351209c4ca9b3a13272fadf3739efb SHA-1: 3ae7cd434e96875033a9e82d6b099d271bfa8609 SHA-256: 1a55c84c2e287b55adf642f4b61ff21a34742bc0ee6bc4eba331b3f831b88911
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL disguised as a dictionary download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://kuzutuzo.ru/aws?utm_term=pocket+oxford+english+dictionary+pdf PDF link annotation
    • http://figojusu.iblogger.org/guidelines_for_anticoagulation_in_prosthetic_heart_valves.pdfIn PDF document text
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/nosotimiw.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/bekezidegeserutefitono.pdfIn PDF document text
    • https://fudewuwadume.weebly.com/uploads/1/3/0/7/130740250/9704828.pdfIn PDF document text
    • http://berozava.iblogger.org/fajunozopomefuw.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/yageEij/best_satisfying_slime_video_ever.pdfIn PDF document text
    • https://zezonusadife.weebly.com/uploads/1/3/1/4/131410479/4a6fd14b1309.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/2013_dodge_avenger_starting_problems.pdfIn PDF document text
    • https://zeduxuvanoripi.weebly.com/uploads/1/3/0/7/130775880/742748.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/ieGicjh/nirikekix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zulilosubefo.rf.gd/52915447301.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/figurative_language_tell_tale_heart_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/89172491548.pdfIn PDF document text
    • http://zazujipediwa.rf.gd/jquery_submit_form_button_name.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/old_alarm_clock_sound.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/sanyo_kaizen_android_smart_tv_review.pdfIn PDF document text
    • http://nisegup.epizy.com/wanofidaretujesimoji.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/28743684942.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 5652 bytes
SHA-256: 0960c0e13c4d2213670420f8b661a584c2847af95ab1cbda1f51370916f8da26
font_02_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 10468 bytes
SHA-256: 1a38711136df65813be41391e34603adaca8db2f80450bde927cdc627b1e0205

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