Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec13bae9588a34cb…

MALICIOUS

PDF

109.6 KB Created: 2021-02-15 00:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5cb39f8aabe803a3b0359f2ae7ab9e9a SHA-1: bd7ab64d44842b75314baabfe904c8c77cc20222 SHA-256: ec13bae9588a34cb9b89203fef05c6332a4398b81958861bcab8afe776aaf849
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the numerous embedded URLs point to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://yafferge.ru/wix?keyword=titan+quest+boss+farming+guide In PDF document text
    • https://cdn.sqhk.co/nuxarufodir/4QZ80d8/87345061603.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/47ifjcV/merge_magic_event_key_items.pdfIn PDF document text
    • http://icub.tech/5116586411vcr52.pdfIn PDF document text
    • https://cdn.sqhk.co/xogedusov/haDpXhg/nigefu.pdfIn PDF document text
    • http://autocredit.moscow/bemownl9ij.pdfIn PDF document text
    • http://aduo5.online/citroen_c4_grand_picasso_owners_manual_201153bvn.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/iIu9hdD/red_roses_lyrics_aj.pdfIn PDF document text
    • http://graatorama.fun/difodobuvamujaal5bt.pdfIn PDF document text
    • https://cdn.sqhk.co/jogujufuza/7ijgjWK/tosoxajolat.pdfIn PDF document text
    • http://dashcamtopbest.com/mat-_checkbox_reactive_formbyn9w.pdfIn PDF document text
    • https://cdn.sqhk.co/xizubutagen/brje1C7/98549341043.pdfIn PDF document text
    • http://goromeo.club/bohemian_rhapsody_piano_solo_sheet_freeuavr2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5fc6910581666.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5ff3a52d1037d.pdfIn PDF document text
    • http://zoneeuro.pro/nukazapuleduwibipesemxyz3u.pdfIn PDF document text
    • http://jopkapopka.online/54010577822wm8ag.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvivazonewa/euhafNn/16000500310.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/VOhjjbv/sheetrock_experts_minnetonka_mn.pdfIn PDF document text
    • https://cdn.sqhk.co/pivatiwon/fjhutjd/jr_harris_fabric_mn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 19908 bytes
SHA-256: 87722da8597998b47927e10f5026b8460da43c1e4a5f59bea29b884ea36108ef
font_02_sfnt_off000150d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D4 5408 bytes
SHA-256: 91be544f203980515b429decc3dc2d1e5696e1111b457872764cdb560ac4aa88
font_03_sfnt_off00016317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16317 14400 bytes
SHA-256: da9c7ac025fe73bd06a529d70d33caf28268c49605736db20dc96e12c38d8030
font_04_sfnt_off000190b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190B4 16640 bytes
SHA-256: 15e2f58402b2a013a1520a037d34aed7b5549b9b8b078f98251228c44293a908

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