Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f7eccd439f1886…

MALICIOUS

PDF

93.7 KB Created: 2021-03-14 07:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8912784d0774c33ee3a8f10d60db11e6 SHA-1: e6155afff1676df26348bcf5ef00868b172625fb SHA-256: a0f7eccd439f1886e64da47d9ba2956411b2998cf7512c00e0c69c2a1d871f54
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/wix?keyword=section+3+reinforcement+periodic+table+word+search+answers PDF link annotation
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/sunupotunoba_leboridojinatil_xoxokisevavogi_satef.pdfIn PDF document text
    • https://gejimedetudumi.weebly.com/uploads/1/3/3/9/133997730/xemanevavafi.pdfIn PDF document text
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/vosebagu.pdfIn PDF document text
    • https://wopokajam.weebly.com/uploads/1/3/0/8/130874492/runonera.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/how_to_identify_delco_remy_alternator.pdfIn PDF document text
    • https://xifuforemavu.weebly.com/uploads/1/3/1/1/131164534/9223200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_6035c09d046f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_60446f0ca2101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_6011fe15e83ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5fefcd54a63da.pdfIn PDF document text
    • http://s7hmus.org/kuwevirajo52gj3.pdfIn PDF document text
    • http://remastacer.com/how_to_assemble_a_large_metal_dog_crateaxh26.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/college_physics_ap_edition_serway.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413585/normal_600d6d524ba88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_604388004fbdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_6043fb84c576c.pdfIn PDF document text
    • http://sweetmeet.online/intermatic_irrigation_timer_manualjyqwz.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/kigavanus/61398887415.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/variable_equations_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/bow_legs_correction_exercise.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_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 5680 bytes
SHA-256: 2676b855b144282a7df7069743d0cca42d66d25b40d1e813e474c3a53184bb17
font_01_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 11548 bytes
SHA-256: 52066d4496d4cc1c27afb4caf56e0f809a2e49922b40c21bf44e0fe4234dd634
font_02_sfnt_off00014504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14504 16264 bytes
SHA-256: 68de6d6b34629de777ab3ab8a9f134c855f305daa617ab346a3ffef9837f5fc7
font_03_sfnt_off00015a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A87 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2