Malicious PDF — malware analysis report

Static analysis result for SHA-256 965933cc77b1a375…

MALICIOUS

PDF

73.8 KB Created: 2021-03-31 09:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 37bf707c6a0c139d996a9ce14e7a4235 SHA-1: 13ef62046c4d1c034df51f5c27f4f68a30a4a990 SHA-256: 965933cc77b1a375733cad48bcc47d49d7e329851dc94c45e4342b9f178dea57
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, several of which point to known malicious redirectors and disposable hosting. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic specifically identifies a lure impersonating WhatsApp, directing users to a malicious PDF hosted on weebly.com. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through credential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/a4889eb5bdb1bc.pdf.
  • 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=fire+rescue+east+2020+rit+competition In PDF document text
    • http://clebohets.xyz/tufewigasuwibuk1ruwn.pdfIn PDF document text
    • http://cmbclientes.com/worukipotisebivovdrpdy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366032/normal_5fcc3a76ab6d1.pdfIn PDF document text
    • http://carinsusa.com/11207926933un4su.pdfIn PDF document text
    • http://yognat.space/fujifilm_xt3_user_guideqm207.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/a4889eb5bdb1bc.pdfIn PDF document text
    • https://rixonusoraj.weebly.com/uploads/1/3/0/7/130738646/jobumoniwen_gatomajas_lizazifamap_vujogi.pdfIn PDF document text
    • https://pabaxugu.weebly.com/uploads/1/3/2/6/132695470/703124.pdfIn PDF document text
    • http://sewonmedix.ru/tukajepefupagkyb2n.pdfIn PDF document text
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/sopenej.pdfIn PDF document text
    • https://zimavilagapiwe.weebly.com/uploads/1/3/2/7/132712623/lobogan.pdfIn PDF document text
    • https://cdn.sqhk.co/jigijobofofa/q5sFijd/melody_holt_new_house.pdfIn PDF document text
    • http://toppiksnack.xyz/61947398519pqy65.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/ibgjjhi/97338334855.pdfIn PDF document text
    • http://lavka-karamel.ru/vanewtbmby.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/29240434380xze8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484636/normal_60374440c8ec4.pdfIn PDF document text
    • http://neip-forum.fun/the_house_with_a_clock_in_its_walls_cast_trailerjnob5.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/ihbF638/48902956473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_602222cecf247.pdfIn PDF document text
    • http://premiumpornclips.com/baybayin_tagalogn5cir.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 5276 bytes
SHA-256: ec58932bd95e2bd3d4e039bc5897dd2d3ec8ac94b9380ef676afaddb0789b17e
font_01_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 11372 bytes
SHA-256: 077d33f0a10e67aeb77a1ea8c3a81eaceee7e63e0baf7856954cdc5ba784968e