Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a352feaf6aacac…

MALICIOUS

PDF

112.1 KB Created: 2021-03-29 22:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a00d943e5d8ccd53e9e11d1621ced4c5 SHA-1: df84114fe3ba6907a0cf28f245da1d50a78a2f92 SHA-256: e5a352feaf6aacac7bc8312ad2b047a1488ec706f1a76e6eaf648ebbf449cf31
162 Risk Score

Malware Insights

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

The sample was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'dafemum.ru'. The ML classifier also assigned a very high probability of maliciousness. While the document body is heavily obfuscated and unreadable, the presence of a malicious URL strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=oxford+chinese+english+dictionary+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_606026a44df16.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/rejevumezonuf.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/8q17hcM/tozexewabekesepi.pdfIn PDF document text
    • http://rezubodojel.medianewsonline.com/xurapigovi.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/17749919561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_601af5b43120d.pdfIn PDF document text
    • https://cdn.sqhk.co/goxupolofodi/wiejgiG/qualification_as_rogue_offline_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452612/normal_5fff476674714.pdfIn PDF document text
    • https://cdn.sqhk.co/wosuzumamig/iciecNW/mimosalekuvureleg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bezorito/album_chungha_blooming_blue.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/buku_marie_kondo_the_life_changing_magic_of_tidying_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbcda272-6b4a-4de6-aab4-567829f227b1/associated_legendre_polynomials_table.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/49457720646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9200f13-af48-47e2-a0bb-16e056e0f6ee/la_biblia_hablada_romanos.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/428706502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8ef3ac-7949-4abb-9437-3b869776518a/jamawemazagimejizux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d32e3f-3c06-4c0d-862b-9dcd3046fae2/weber_spirit_e210_burner_covers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4dbabbc-719d-4c8b-90c3-a39da6f09c15/sovebagegiduzosixajalin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a41f559-6b23-4b6a-97ca-4ebc2b1f70cb/what_is_the_structure_of_a_cover_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/chaar_churiyan_video_song_free.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 41476 bytes
SHA-256: c45afd9e08d43fa03f497c3ebb766518c9f0ec4bba90a333fc15905be4092efd
font_01_sfnt_off00016be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE5 5464 bytes
SHA-256: c7e919ec47908895fcacb6ebdf4563bdd59f62b0d4d2a33a610c2e962003449c
font_02_sfnt_off00017e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E83 11064 bytes
SHA-256: 8fec1fdaeaef52e2664b9ef55185c25327de0f608e444f4134267db6d3f36c54
font_03_sfnt_off0001a46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A46E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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