Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff5b7ac2122e737…

MALICIOUS

PDF

93.5 KB Created: 2021-02-06 04:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0293f4dcde0fefb95d9558617377a7a4 SHA-1: 6c5d384b70a11b96d0b13426694826ed4573bdde SHA-256: dff5b7ac2122e7370eb9bb0e18e3a9b5ed4e37caff488ad2a8bff611f2242f0f
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While the document body is heavily obfuscated, the presence of a malicious redirector URL suggests a phishing or malware distribution attempt. No scripts were extracted, but the primary attack vector appears to be a malicious link embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/aws?utm_term=research+articles+on+education+in+pakistan+pdf In PDF document text
    • http://magnitoli-2ekran.site/nejonidimomapahcvch.pdfIn PDF document text
    • http://guromufupadaf.iblogger.org/the_forbidden_kingdom_parents_guide.pdfIn PDF document text
    • http://onlinesos.tech/kudasuzawuh6zuq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501385/normal_60012bf16c601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379489/normal_5fdd12aaa9fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501659/normal_6011e339201f3.pdfIn PDF document text
    • http://edevletorg.com/tree_frog_craft_for_preschoolersn0wv9.pdfIn PDF document text
    • http://clipshd.design/lenguaje_corporal_manos2eexx.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/xufoxorog/cafeland_cheat_engine_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/41453043826.pdfIn PDF document text
    • http://tegazadolital.rf.gd/kendriya_vidyalaya_admission_guidelines_2018-_19.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/guide_disability_services_act_2006_qld.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/vofibejuwivoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/politik_pintu_terbuka.pdfIn PDF document text
    • http://mujigivufutufu.rf.gd/52836149042.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/blacklist_apk_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/dubai_babu_kannada_songs.pdfIn PDF document text
    • http://feriwodopumumo.rf.gd/gizulozejebovosuxize.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_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 5316 bytes
SHA-256: af18d6794df6ae0673125350c529122c0f43ffb4e6b972e06c827eb2f73785e8
font_01_sfnt_off000141a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A5 11480 bytes
SHA-256: e4e899d8b7ee4ab92c8a9c4efc3a62f48bbf2c7f1fcfc6f3f1993d4bedaaa61a

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