Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f26300bb935af3e…

MALICIOUS

PDF

75.7 KB Created: 2021-04-07 00:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03009160bcffad9732a6209db062e809 SHA-1: bf0141e7f65f6288964a426bd2343098e6cc9f40 SHA-256: 7f26300bb935af3e64da2c0ce4770153c73a11f8cec8a98c4542d061549f3ee3
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a critical ClamAV detection. The document appears to be a lure, disguised as a crossword answer key, which contains a large number of external links, many of which point to potentially malicious or SEO-farmed content. The primary malicious URL identified is dafemum.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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.
  • 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/wix?keyword=pltw+crossword+answer+key+1.1 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4452395/normal_5ff849c3ba02c.pdfIn PDF document text
    • http://judupebe.getenjoyment.net/1966_cessna_150_poh.pdfIn PDF document text
    • http://mivimivisodawo.iblogger.org/59501589355.pdfIn PDF document text
    • https://vixananuxa.weebly.com/uploads/1/3/4/8/134881407/jamanutu_fotuvadizinavos_konufejog_ronet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5fe79e59713c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_605719acd723b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410018/normal_5fee0c1a3181b.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/db85a7.pdfIn PDF document text
    • http://kixamugefuwa.22web.org/unilorin_2nd_batch_admission_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366020/normal_5fc810cdc90b4.pdfIn PDF document text
    • http://palefazorubo.22web.org/i_am_who_you_say_i_am_song_lyrics.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/xisakazelelinim/29673364534.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/harassment_sentencing_guidelines_crown_court.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/binary_to_decimal_conversion_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/desawokalivadanijomif.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/buvezezitinujuponekulap.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/how_to_tell_if_your_harry_potter_books_are_first_editions.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/rename_apk_package_name_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/how_many_calories_in_food_list_uk.pdfIn PDF document text
    • http://bebojivim.myartsonline.com/gta_vice_city_stories_cheats_ps2.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/how_to_find_cuisinart_coffee_maker_model_number.pdfIn PDF document text
    • http://sagoralezerelo.onlinewebshop.net/xaroxusuzavuwiwukenado.pdfIn PDF document text
    • http://jukujomufo.rf.gd/50604932642.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/how_to_bind_traxxas_receiver.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 5276 bytes
SHA-256: 7eefcee2396bddbcfa12a7340990eb6a882d6361507ccfe40d91da5b904b8d2a
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 11148 bytes
SHA-256: 07b6bbcc73b709305131ac2faac36de9783a9f40b5274281d5837a024dbbaec5

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