Malicious PDF — malware analysis report

Static analysis result for SHA-256 081f1dfa292a1c48…

MALICIOUS

PDF

73.0 KB Created: 2021-03-29 03:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e882e74483cf7aac6fec4de1b3674802 SHA-1: 9b75681f33a3ace119981aee2bcf588b0a8db71c SHA-256: 081f1dfa292a1c486ba5e3f9be2c9d1634f71e16d03683b9922dd5ec7f30e593
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'dafemum.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the redirector suggest an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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=bowling+green+mo+high+school+calendar In PDF document text
    • https://cdn.sqhk.co/zopizote/s2Iifij/jujogejogirimo.pdfIn PDF document text
    • http://tisejamebip.sportsontheweb.net/67623458551.pdfIn PDF document text
    • https://koturukumofup.weebly.com/uploads/1/3/4/8/134883222/17882.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/setoxotojezod.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/yUyaidO/dealsperk_online_shopping_deals_coupons_application.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/Bt69zic/xfinity_race_today_live.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/geK9Whb/sunelolumi.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/66373663893.pdfIn PDF document text
    • http://botefedej.sportsontheweb.net/systematic_sampling_advantages_and_disadvantages.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/7073934.pdfIn PDF document text
    • https://cdn.sqhk.co/fepotifomowa/ixjfijZ/panic_buddy_end_panic_attacks_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokerek.epizy.com/fopuviki.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/bhagavathi_tamil_movie_bgm.pdfIn PDF document text
    • http://wekidezeze.epizy.com/laxixiferu.pdfIn PDF document text
    • http://dowavatig.rf.gd/free_positive_and_negative_number_line_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/lenixisetudarosek.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/can_you_get_arrested_for_killing_a_bald_eagle.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/crazy_frog_1080p_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/vande_mataram_lyrics_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/vezozevatabubawix.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/madusufozojivufepixev.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_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 5496 bytes
SHA-256: 02470ddc2e76443334103e760031ecf180547ede9ef71491035c39a094c5f39c
font_01_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 11056 bytes
SHA-256: f6bbb9ab32cc084cbefd1848ed2901cc77c94a1497d298f7b4e0f67b9165ca62

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