Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef0f870e4e08f60…

MALICIOUS

PDF

79.1 KB Created: 2021-02-12 13:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ca31f2974a4d4538dfc457e444dca48d SHA-1: c708a0aa28c8503b4a6026d0ddfcd105c8cec9ab SHA-256: eef0f870e4e08f60ba7bb2be24cb9e9c7d49a56923a79226962de8b3035eda70
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains strings related to the URL's keyword, suggesting a lure. The presence of numerous links to disposable hosting further supports a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/wix?keyword=naruto+ultimate+ninja+blazing+jp+apk In PDF document text
    • http://saratov.ooo/25083341711r2xv2.pdfIn PDF document text
    • https://jebelobuf.weebly.com/uploads/1/3/1/4/131452997/8129436a.pdfIn PDF document text
    • http://epipog.com/animorphs_books6qufx.pdfIn PDF document text
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/jukasumereliwajonos.pdfIn PDF document text
    • http://anarchymedya.com/66448984904vf4ct.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furovival.rf.gd/manaxamomoxifibubudipu.pdfIn PDF document text
    • http://gevegure.rf.gd/carb_cycling_diet_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/bafuzigopewafowen.pdfIn PDF document text
    • http://zezazemana.epizy.com/latest_song_ringtones_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/bloodline_movie_parents_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 5212 bytes
SHA-256: 36e7c80598eb465087ec92d7389e0216eb1abe6ca411eca74e5f0b3cc8cf7b96
font_01_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5260 bytes
SHA-256: f6fb4406a82c05299021e8542e899f41abf847b2ed2cb4d50df28cc3333900fa
font_02_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 10380 bytes
SHA-256: 7e15ba753165954cdef176eb7cf3b51566ec4a39c3cae4065945ce4f56d99322
font_03_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 16292 bytes
SHA-256: fb760c8cdbe7d666a9028005086d7fbfbe28b8c1e5ae2c3e390f3660c6f5afa9